**Triginometry Finding an Angle Using the Cosine Rule**

In order to find the sine of an angle, you must know the lengths of the opposite side and the hypotenuse. You will always be given the lengths of two sides, but if the two sides arenâ€™t the ones you need to find a certain ratio, you can use the Pythagorean theorem to find the missing one.... The trigonometric function sine, like the cosine and the tangent, is based on a right-angled triangle. In math class, the sine of an angle is found by dividing the length of the side opposite the angle by the length of the hypotenuse.

**Use Excel SIN Function to Find the Sine of an Angle**

The argument of the cosine function is double that of the sine function--just expressed differently. Solving for #sin(x/2)# , we see that #2sin^2(x/2)=1-cos(x)#... 17/05/2010Â Â· Another way to go about it, is to draw a unit circle, mark out the angle from the center and find the coordinates of the intersection with the unit circle. The X coordinate would be the cosine of the angle, and the Y coordinate would be the sine.

**High School Trigonometry/Radian Measure Wikibooks open**

17/05/2010Â Â· Another way to go about it, is to draw a unit circle, mark out the angle from the center and find the coordinates of the intersection with the unit circle. The X coordinate would be the cosine of the angle, and the Y coordinate would be the sine.... The cosine (cos) of an acute angle in a right angled triangle is the ratio between the side adjacent to the angle and the hypotenuse of the triangle. Example 5 Use the cosine function to find the angle A giving your answer to the nearest degree .

**Trigonometry- If sinx = 3/5 and cos y=5/13 find the value**

The cosine (cos) of an acute angle in a right angled triangle is the ratio between the side adjacent to the angle and the hypotenuse of the triangle. Example 5 Use the cosine function to find the angle A giving your answer to the nearest degree .... Using the COS function to find the cosine of an angle may be easier than doing it manually, but, as mentioned, it is important to realize that when using the COS function, the angle needs to be in radians rather than degrees - which is the unit most of us are not familiar.

## How To Find An Angle From The Answer Of Cos

### Inverses of Trigonometric Ratios purplemath.com

- Use Excel SIN Function to Find the Sine of an Angle
- How to calculate cos sine etc. without a calculator Quora
- How to find sin cos and tan without a calculator. Does
- How do you find the angle of a cosine science.answers.com

## How To Find An Angle From The Answer Of Cos

### The inverse trigonometric functions (sin-1, cos-1, and tan-1) allow you to find the measure of an angle in a right triangle. All that you need to know are any two sides as well as how to use SOHCAHTOA.

- with (x,y)=(âˆ’4,3)and find the inverse cosine, Î¸=cosâˆ’1(âˆ’0.8). Note that I had to put the angle Note that I had to put the angle in parentheses to avoid any confusion.
- Trigonometric Functions Questions With Answers . A set of trigonometry questions related to trigonometric functions are presented. The solutions and answers are provided. Questions 1: Find the exact value of sin (x / 2) if sin (x) = 1 / 4 and x is such that Pi / 2< x < Pi. Solution to Question 1: To find sin (x/2), we use the following half angle formula sin (x/2) = + or - SQRT [ (1 - cos x
- The trigonometric function sine, like the cosine and the tangent, is based on a right-angled triangle. In math class, the sine of an angle is found by dividing the length of the side opposite the angle by the length of the hypotenuse.
- Step 3 For Sine calculate Opposite/Hypotenuse, for Cosine calculate Adjacent/Hypotenuse or for Tangent calculate Opposite/Adjacent. Step 4 Find the angle from your calculator, using one of sin -1 , cos â€¦

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