Sin 75 degrees in fraction

sin(225°) sin ( 225 °) Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because sine is negative in the third quadrant. −sin(45) - sin ( 45) The exact value of sin(45) sin ( 45) is √2 2 2 2. − √2 2 - 2 2. The result can be shown in multiple forms.

Medicine Matters Sharing successes, challenges and daily happenings in the Department of Medicine ARTICLE: Endomyocardial Biopsy Characterization of Heart Failure With Preserved Ej... Trigonometry. Convert from Degrees to Radians sin (75) sin(75) sin ( 75) To convert degrees to radians, multiply by π 180° π 180 °, since a full circle is 360° 360 ° or 2π 2 π radians. The exact value of sin(75) sin ( 75) is √2+√6 4 2 + 6 4. Tap for more steps... √2+√6 4 ⋅ π 180 2 + 6 4 ⋅ π 180 radians. Multiply √2+√6 ... The formula to convert radians to degrees: degrees = radians * 180 / π What is cotangent equal to? The cotangent function (cot(x)), is the reciprocal of the tangent function.cot(x) = cos(x) / sin(x)Read all about Singapore Changi Airport (SIN) here as TPG brings you all related news, deals, reviews and more. Singapore Changi Airport is one of the largest transportation hubs i...Calculating arctangent of a fraction. Oftentimes the tangent value will be given or calculated as a simple fraction, e.g. 3/4. While one can use a fraction to decimal converter to convert the fraction into a decimal, our arctangent calculator actually supports direct input of various fractions like 1/2, 1/3, 1/6, 3/4, 4/3, -2/3, and even 0.3/.5 . To compute arctan(3/4) or …Trigonometric Sine Values Chart in Degrees. This table provides the sin values for each angle from 0° through 360°. α. 0°. 30°. 45°. 60°.Algebra. Fraction Calculator. Step 1: Enter the fraction you want to simplify. The Fraction Calculator will reduce a fraction to its simplest form. You can also add, subtract, multiply, and divide fractions, as well as, convert to a decimal and work with mixed numbers and reciprocals. We also offer step by step solutions.InvestorPlace - Stock Market News, Stock Advice & Trading Tips Environmental, social, governance (ESG) investing has been a major theme in rec... InvestorPlace - Stock Market N...

\sin (x)+\sin (\frac{x}{2})=0,\:0\le \:x\le \:2\pi \cos (x)-\sin (x)=0 ; 3\tan ^3(A)-\tan (A)=0,\:A\in \:\left[0,\:360\right] \sin (75)\cos (15) \sin (120) \csc (-\frac{53\pi }{6}) prove\:\tan^2(x) …Explanation: For sin 65 degrees, the angle 65° lies between 0° and 90° (First Quadrant ). Since sine function is positive in the first quadrant, thus sin 65° value = 0.9063077. . . Since the sine function is a periodic function, we can represent sin 65° as, sin 65 degrees = sin (65° + n × 360°), n ∈ Z. ⇒ sin 65° = sin 425° = sin ...In this video, we are going to find the value of the sine of 75 degrees. Here, I have applied the identity sin(A + B) or sin(x + y).#sineof75 #sin75You can e...For sin 33 degrees, the angle 33° lies between 0° and 90° (First Quadrant ). Since sine function is positive in the first quadrant, thus sin 33° value = 0.5446390. . . Since the sine function is a periodic function, we can represent sin 33° as, sin 33 degrees = sin (33° + n × 360°), n ∈ Z. ⇒ sin 33° = sin 393° = sin 753°, and so on. Compute answers using Wolfram's breakthrough technology & knowledgebase, relied on by millions of students & professionals. For math, science, nutrition, history ... InvestorPlace - Stock Market News, Stock Advice & Trading Tips Environmental, social, governance (ESG) investing has been a major theme in rec... InvestorPlace - Stock Market N...Dec 7, 2020 · This video works to determine the exact value for the sine of 75 degrees in two different ways: using the sum formula for sine and using the half-angle ident... Medicine Matters Sharing successes, challenges and daily happenings in the Department of Medicine ARTICLE: Cellular and molecular pathobiology of heart failure with preserved eject...

Use some half angle formulas: #sin(theta/2) = +-sqrt((1-cos theta) / 2)# #cos(theta/2) = +-sqrt((1+cos theta) / 2)# Also use a known value #cos 30^o = sqrt(3)/2#. If we stick to the first quadrant, we can take the sign of the square root to be #+# in both cases.Although the Bible does clearly show that people need to repent for all sins, there is no passage that says that all sins are equal; instead, the Bible shows some sins cause more g...My Delano Las Vegas review goes over all of the ins and outs of one of the most underrated properties in sin city. A great Amex FHR option. Increased Offer! Hilton No Annual Fee 70...The Google stock split is here at last. Interested investors have the chance to buy GOOGL stock at a nearly 10-year low of just $112. Alphabet is climbing after a monumental split ...

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sin(90° + 75°) = sin 165° sin(90° - 75°) = sin 15° Cos 75 Degrees Using Unit Circle. To find the value of cos 75 degrees using the unit circle: Rotate ‘r’ anticlockwise to form 75° angle with the positive x-axis. The cos of 75 degrees equals the x-coordinate(0.2588) of the point of intersection (0.2588, 0.9659) of unit circle and r. Find exact value of sin (105) Ans: (sqrt(2 + sqrt3)/2) sin (105) = sin (15 + 90) = cos 15. First find (cos 15). Call cos 15 = cos x Apply the trig identity: cos 2x = 2cos^2 x - 1. cos 2x = cos (30) = sqrt3/2 = 2cos^2 x - 1 2cos^2 x = 1 + sqrt3/2 = (2 + sqrt3)/2 cos^2 x = (2 + sqrt3)/4 cos x = cos 15 = (sqrt(2 + sqrt3)/2. (since cos 15 is positive) sin (105) = cos …The value of Cos 15 is 0.96592582, it can also be written as Cos (45-30) º. Cos 15 º can be calculated in few ways, one of them being Cos 15 º = Cos (45-30) º and the other being Cos 2θ=2Cos2θ-1, In this if Ɵ = 15 º then Cos 15 º can be calculated by using Cos 30 º using the trigonometric table. We will be using both the methods to ...This is a simple trigonometric sine calculator to calculate the sin value in degrees or radians. In order to calculate the sin value on the calculator, just enter the angle and select the angle type as degrees (°) or radians (rad) from the drop down select menu. The calculator will instantly gives you in the result of the sine value. α sin (α)Jan 12, 2016 ... Exact Value of sin(75). The Math Sorcerer•16K ... Finding the exact value for sine of 15 degrees using the half angle formula ... Evaluate the half ... Find the Exact Value sin (135 degrees ) sin(135°) sin ( 135 °) Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. sin(45) sin ( 45) The exact value of sin(45) sin ( 45) is √2 2 2 2. √2 2 2 2. The result can be shown in multiple forms. Exact Form: √2 2 2 2.

Nov 2, 2022 · Let us find the value of $\sin 75$ using the formula of the compound angles of sine functions. The following formula is the key to find sin 75 degree: sin(A+B) = sin A cos B + cos A sin B . Note that we can write sin 75 as follows: $\sin 75 = \sin(45 +30)$ Order of Operations Factors & Primes Fractions Long Arithmetic Decimals Exponents & Radicals Ratios & Proportions Percent ... Roman Numerals Radical to Exponent Exponent to Radical To Fraction To Decimal To Mixed Number To Improper Fraction Radians to Degrees Degrees to Radians Hexadecimal Scientific Notation Distance ... \sin (75)\cos …Solution : The value of sin 75 degrees is 3 + 1 2 2. Proof : We will write sin 75 as sin (45 + 30). By using formula sin (A + B) = sin A cos B + cos A sin B,Cos 15° in fraction: (√6 + √2)/4; Cos (-15 degrees): 0.9659258. . . Cos 15° in radians ... (90° - 15°) = sin 75° ☛ Also Check: cos 45 degrees; cos 90 degrees; cos 150 degrees; cos 140 degrees; cos 144 degrees; cos 720 degrees; Examples Using Cos 15 Degrees. Example 1: Find the value of 2 cos(15°)/3 sin(75°). Solution: Using ...Duolingo is launching its math app, for adults and children, to the public today. It is available on iOS and is free for users. Duolingo is launching its math app to the public mon...sin 5° = 0.08716. sin 5 degrees = 0.08716. The sin of 5 degrees is 0.08716, the same as sin of 5 degrees in radians. To obtain 5 degrees in radian multiply 5° by π / 180° = 1/36 π. Sin 5degrees = sin (1/36 × π). Our results of sin5° have been rounded to five decimal places. If you want sine 5° with higher accuracy, then use the ...Find the Exact Value sin(70 degrees ) Step 1. The result can be shown in multiple forms. Exact Form: Decimal Form: ...Online degrees allow busy people to continue their education. Find out what employers think of online degrees and how to evaluate online degree programs. Advertisement Earning a de...tan (75°) = 3.7320508076. tan (75°) is exactly: 2 + √3. Note: angle unit is set to degrees. Use our tan (x) calculator to find the exact value of tangent of 75 degrees - tan (75 °) - or the tangent of any angle in degrees and in radians.Find exact value of sin (105) Ans: (sqrt(2 + sqrt3)/2) sin (105) = sin (15 + 90) = cos 15. First find (cos 15). Call cos 15 = cos x Apply the trig identity: cos 2x = 2cos^2 x - 1. cos 2x = cos (30) = sqrt3/2 = 2cos^2 x - 1 2cos^2 x = 1 + sqrt3/2 = (2 + sqrt3)/2 cos^2 x = (2 + sqrt3)/4 cos x = cos 15 = (sqrt(2 + sqrt3)/2. (since cos 15 is positive) sin (105) = cos (15) = sqrt(2 + sqrt3)/2 ...Learn how to derive the exact value of sine of angle 75 degrees in fraction form using trigonometric identities and simplification. The answer is sin (75°) = 6 + 2 4.Welcome to sin 75°, our post aboutthe sine of 75 degrees. For the sine of 75 degrees we use the abbreviation sin for the trigonometric function together with the degree symbol °, and write it as sin 75°. If you have been looking for what is sin 75°, or if you have been wondering about sin 75 degrees in radians, then you are right here, too.

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Cos 75 degrees is the value of cosine trigonometric function for an angle equal to 75 degrees. Understand methods to find the value of cos 75 degrees with examples and FAQs. ... Cos 75° in fraction: (√6 - √2)/4; Cos (-75 degrees): 0.2588190. . . Cos 75° in radians: cos (5π/12) or cos ... sin(90° - 75°) = sin 15° Cos 75 Degrees Using ...To find the value of sin 22 degrees using the unit circle: Rotate ‘r’ anticlockwise to form a 22° angle with the positive x-axis. The sin of 22 degrees equals the y-coordinate (0.3746) of the point of intersection (0.9272, 0.3746) of unit circle and r. Hence the value of sin 22° = y = 0.3746 (approx)Or you can say, the Sine of angle α is equal to the ratio of the opposite side (perpendicular) and hypotenuse of a right-angled triangle. The trigonometry ratios sine, cosine and tangent for an angle α are the primary functions. The value for sin 45 degrees and other trigonometry ratios for all the degrees 0°, 30°, 60°, 90°,180° are ...To find the value of sin 22 degrees using the unit circle: Rotate ‘r’ anticlockwise to form a 22° angle with the positive x-axis. The sin of 22 degrees equals the y-coordinate (0.3746) of the point of intersection (0.9272, 0.3746) of unit circle and r. Hence the value of sin 22° = y = 0.3746 (approx)as shown in the image to the right. Note that the denominator of a fraction cannot be 0, as it would make the fraction undefined. Fractions can undergo many different operations, some of which are mentioned below. Addition: Unlike adding and subtracting integers such as 2 and 8, fractions require a common denominator to undergo these operations.Trigonometry. Find the Exact Value sin (7.5) sin(7.5) sin ( 7.5) Rewrite 7.5 7.5 as an angle where the values of the six trigonometric functions are known divided by 2 2. sin(15 2) sin ( 15 2) Apply the sine half - angle identity. ±√ 1−cos(15) 2 ± 1 - cos ( 15) 2. Change the ± ± to + + because sine is positive in the first quadrant.Answer: sin (45°) = 0.7071067812. sin (45°) is exactly: √2/2. Note: angle unit is set to degrees. Use our sin (x) calculator to find the exact value of sine of 45 degrees - sin (45 °) - or the sine of any angle in degrees and in radians.

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From the above equations, we get sin 60 degrees exact value as √3/2. In the same way, we can find the values for cos and tan ratios. Therefore, the exact value of sin 60 degrees is √3/2. Cos 0° = Sin 90° = 1. Cos 30°= Sin 60° = √3/2. Cos 45° = Sin 45° = 1/√2. Cos 60° = Sin 30° =1/2.Question 754020: What is the exact value of sin(75) degrees Found 2 solutions by lwsshak3, Edwin McCravy: Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website! What is the exact value of sin(75) degrees sin75º=sin(30)º+45º) =sin 30 cos 45+cos 30 sin 45 Compute answers using Wolfram's breakthrough technology & knowledgebase, relied on by millions of students & professionals. For math, science, nutrition, history ... A bachelor's degree in aviation will qualify you for work as an airline or commercial pilot. Updated May 23, 2023 thebestschools.org is an advertising-supported site. Featured or t... Answer: sin (75°) = 0.9659258263. sin (75°) is exactly: (√2/4) (√3 + 1) Note: angle unit is set to degrees. Use our sin (x) calculator to find the exact value of sine of 75 degrees - sin (75 °) - or the sine of any angle in degrees and in radians. Trigonometry. Find the Exact Value sin (165) sin(165) sin ( 165) Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. sin(15) sin ( 15) Split 15 15 into two angles where the values of the six trigonometric functions are known. sin(45−30) sin ( 45 - 30) Separate negation.Use the compound angle formula for sin(A+B) Split the 75 into two angles whose sine and cosine you already know, then use the compound angle formula. Expand and then substitute the known values in, and simplify. sin(75)=sin(30+45) sin(30+45)=sin30cos45+sin45cos30 sin(75)=1/2*sqrt2/2 +sqrt2/2*sqrt3/2 …Formula for compound angles of sine, cosine and tangent trigonometric ratios are given as follows: We are supposed to find the value of sin 75°. 75 can also be written as 30 + 45. We will apply trigonometric ratios of compound angles. We know that sin 30° = $\dfrac {1} {2}$, cos 45° = sin 45° = $\dfrac {1} {\sqrt {2}}$ and cos 30 ...Use some half angle formulas: #sin(theta/2) = +-sqrt((1-cos theta) / 2)# #cos(theta/2) = +-sqrt((1+cos theta) / 2)# Also use a known value #cos 30^o = sqrt(3)/2#. If we stick to the first quadrant, we can take the sign of the square root to be #+# in both cases.. #cos 15^o = sqrt((1+cos 30^o)/2)# ….

From the above equations, we get sin 60 degrees exact value as √3/2. In the same way, we can find the values for cos and tan ratios. Therefore, the exact value of sin 60 degrees is √3/2. Cos 0° = Sin 90° = 1. Cos 30°= Sin 60° = √3/2. Cos 45° = …Find the Exact Value sin(75 degrees ) Step 1. Split into two angles where the values of the six trigonometric functions are known. Step 2. Apply the sum of angles ...Answer: sin (30°) = 0.5. sin (30°) is exactly: 1/2. Note: angle unit is set to degrees. Online sine calculator. Accepts values in radians and in degrees. Free online sine calculator. sin (x) calculator. To find the value of sin 105 degrees using the unit circle: Rotate ‘r’ anticlockwise to form a 105° angle with the positive x-axis. The sin of 105 degrees equals the y-coordinate (0.9659) of the point of intersection (-0.2588, 0.9659) of unit circle and r. Hence the value of sin 105° = y = 0.9659 (approx) Trigonometry. Find the Exact Value sin (165) sin(165) sin ( 165) Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. sin(15) sin ( 15) Split 15 15 into two angles where the values of the six trigonometric functions are known. sin(45−30) sin ( 45 - 30) Separate negation.sin ⁡ ( 45 °) = 2 / 2. \sin (45\degree) = \sqrt {2}/2 sin(45°) = 2. . /2. Other interesting angles are 30\degree 30° and 60\degree 60°, as they appear in other special …Find the Exact Value sin (135 degrees ) sin(135°) sin ( 135 °) Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. sin(45) sin ( 45) The exact value of sin(45) sin ( 45) is √2 2 2 2. √2 2 2 2. The result can be shown in multiple forms. Exact Form: √2 2 2 2.Roman Numerals Radical to Exponent Exponent to Radical To Fraction To Decimal To Mixed Number To Improper Fraction Radians to Degrees Degrees to ... \sin (x)+\sin ...Free math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor. Sin 75 degrees in fraction, To find the value of tan 75 degrees using the unit circle: Rotate ‘r’ anticlockwise to form 75° angle with the positive x-axis. The tan of 75 degrees equals the y-coordinate (0.9659) divided by x-coordinate (0.2588) of the point of intersection (0.2588, 0.9659) of unit circle and r. Hence the value of tan 75° = y/x = 3.7321 (approx)., This video works to determine the exact value for the sine of 15 degrees in two different ways: using the difference formula for sine and using the half-angl..., Roman Numerals Radical to Exponent Exponent to Radical To Fraction To Decimal To Mixed Number To Improper Fraction Radians to Degrees Degrees to ... \sin (x)+\sin ... , To find the value of sin 60 degrees using the unit circle: Rotate ‘r’ anticlockwise to form a 60° angle with the positive x-axis. The sin of 60 degrees equals the y-coordinate (0.866) of the point of intersection (0.5, 0.866) of unit circle …, For sin 15 degrees, the angle 15° lies between 0° and 90° (First Quadrant ). Since sine function is positive in the first quadrant, thus sin 15° value = (√6 - √2)/4 or 0.2588190. . . Since the sine function is a periodic function, we can represent sin 15° as, sin 15 degrees = sin (15° + n × 360°), n ∈ Z. ⇒ sin 15° = sin 375 ..., The value of Cos 15 is 0.96592582, it can also be written as Cos (45-30) º. Cos 15 º can be calculated in few ways, one of them being Cos 15 º = Cos (45-30) º and the other being Cos 2θ=2Cos2θ-1, In this if Ɵ = 15 º then Cos 15 º can be calculated by using Cos 30 º using the trigonometric table. We will be using both the methods to ..., Free Fractions calculator - Add, Subtract, Reduce, Divide and Multiply fractions step-by-step, To find the value of sin 35 degrees using the unit circle: Rotate ‘r’ anticlockwise to form a 35° angle with the positive x-axis. The sin of 35 degrees equals the y-coordinate (0.5736) of the point of intersection (0.8192, 0.5736) of unit circle and r. Hence the value of sin 35° = y = 0.5736 (approx), For sin 15 degrees, the angle 15° lies between 0° and 90° (First Quadrant ). Since sine function is positive in the first quadrant, thus sin 15° value = (√6 - √2)/4 or 0.2588190. . . Since the sine function is a periodic function, we can represent sin 15° as, sin 15 degrees = sin (15° + n × 360°), n ∈ Z. ⇒ sin 15° = sin 375 ..., degrees/360 = fraction. 75/360 = 5/24. 75 degrees = 5/24. Below is an illustration showing you what 75 degrees and 5/24 of a circle looks like. To create the illustration above showing you 75 degrees, we first drew a circle and then drew two lines from the center, separated by 75 degrees. The slice that the two lines create inside the circle is ..., Explanation: For sin 56 degrees, the angle 56° lies between 0° and 90° (First Quadrant ). Since sine function is positive in the first quadrant, thus sin 56° value = 0.8290375. . . ⇒ sin 56° = sin 416° = sin 776°, and so on. Note: Since, sine is an odd function, the value of sin (-56°) = -sin (56°)., Free equations calculator - solve linear, quadratic, polynomial, radical, exponential and logarithmic equations with all the steps. Type in any equation to get the solution, steps and graph, Value of sin 15 degrees can be created with the use of trigonometric functions.The word trigonometry comes from the Greek words trigonon (“triangle”) and metron (“to measure”).. The value of sin 15 degrees can be represented in terms of fractions form.; Trigonometry is the branch of mathematics with specific functions of …, Free Fractions calculator - Add, Subtract, Reduce, Divide and Multiply fractions step-by-step, Medicine Matters Sharing successes, challenges and daily happenings in the Department of Medicine ARTICLE: Cellular and molecular pathobiology of heart failure with preserved eject..., The seven deadly sins, or cardinal sins as they’re also known, are a group of vices that often give birth to other immoralities, which is why they’re classified above all others. T..., It uses functions such as sine, cosine, and tangent to describe the ratios of the sides of a right triangle based on its angles. What are the 3 types of trigonometry functions? The three basic trigonometric functions are: Sine (sin), Cosine (cos), and Tangent (tan). , Free math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor., sin 35° = 0.57358. sin 35 degrees = 0.57358. The sin of 35 degrees is 0.57358, the same as sin of 35 degrees in radians. To obtain 35 degrees in radian multiply 35° by π / 180° = 7/36 π. Sin 35degrees = sin (7/36 × π). Our results of sin35° have been rounded to five decimal places. If you want sine 35° with higher accuracy, then use ..., Discover what courses you take as an English major and how this degree can prepare you for a career in publishing, writing, or media and communications. Updated May 23, 2023 thebes..., Find the Exact Value sin(70 degrees ) Step 1. The result can be shown in multiple forms. Exact Form: Decimal Form: ..., This is a simple trigonometric sine calculator to calculate the sin value in degrees or radians. In order to calculate the sin value on the calculator, just enter the angle and select the angle type as degrees (°) or radians (rad) from the drop down select menu. The calculator will instantly gives you in the result of the sine value. α sin (α), If the angle is unknown, but the lengths of the opposite and adjacent side in a right-angled triangle are known, then the tangent can be calculated from these two measurements. For example, if a = 15 and b = 20, then tan(α) = 15 / 20 = 0.75. Applications of the tangent function, For sin 36 degrees, the angle 36° lies between 0° and 90° (First Quadrant ). Since sine function is positive in the first quadrant, thus sin 36° value = √ (10 - 2√5)/4 or 0.5877852. . . Since the sine function is a periodic function, we can represent sin 36° as, sin 36 degrees = sin (36° + n × 360°), n ∈ Z. ⇒ sin 36° = sin 396 ..., prove\:\tan^2(x)-\sin^2(x)=\tan^2(x)\sin^2(x) prove\:\cot(2x)=\frac{1-\tan^2(x)}{2\tan(x)} prove\:\csc(2x)=\frac{\sec(x)}{2\sin(x)} prove\:\frac{\sin(3x)+\sin(7x ..., This is a simple trigonometric sine calculator to calculate the sin value in degrees or radians. In order to calculate the sin value on the calculator, just enter the angle and select the angle type as degrees (°) or radians (rad) from the drop down select menu. The calculator will instantly gives you in the result of the sine value. α sin (α), Free Fractions calculator - Add, Subtract, Reduce, Divide and Multiply fractions step-by-step, We use sin, cos, and tan functions to calculate the angles. The degrees used commonly are 0, 30, 45, 60, 90, 180, 270 and 360 degrees. We use these degrees to find the value of the other trigonometric angles like the value of sine 15 degrees. What is the value of Sin 15°? The actual value of sin 15 degrees is given by: , a unit of plane angular measurement that is equal to the angle at the center of a circle subtended by an arc whose length equals the radius or approximately 180°/π ~ 57.3 degrees. secant. the length of the hypotenuse divided by the length of the adjacent side. Also equals 1/cos (θ) sin. sin (θ) is the ratio of the opposite side of angle θ ..., Sine. Sine, written as sin⁡(θ), ... Below are 16 commonly used angles in both radians and degrees, along with the coordinates of their corresponding points on the unit circle. ... One method that may help with memorizing these values is to express all the values of sin(θ) as fractions involving a square root. Starting from 0° and ..., sin 75 ∘ can be expressed as, sin 75 ∘ = sin (45 ∘ + 30 ∘) We know that sin ⁡ (A + B) = sin ⁡ A cos ⁡ B + cos ⁡ A sin ⁡ B. So by applying the above formula we get, sin 75 ∘ = sin 45 ∘ cos 30 ∘ + cos 45 ∘ sin 30 ∘. As, sin 45 ∘ = 1 2, cos 30 ∘ = 3 2 =, cos 45 ∘ = 1 2 and sin 30 ∘ = 1 2. By substituting the ... , Trigonometry. Find the Exact Value sin (195) sin(195) sin ( 195) Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because sine is negative in the third quadrant. −sin(15) - sin ( 15), Trigonometry. Find the Exact Value sin (195) sin(195) sin ( 195) Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because sine is negative in the third quadrant. −sin(15) - sin ( 15)