Question

how do you find sin theta and cosine theta of angles?


ex. Find the sine theta and cosine theta of 150 degrees as well as the degrees in radians?

Answer 1

For the sine and cosine functions, you need a calculator, a slide rule (if there is one in the attic) or a table of trigonometric functions. There are also web sites you can use.

Sin 150 degrees = 1/2, exactly
cos 150 degrees = -(sqrt 3)/2
You can prove that with geometry, but other angles usually require a calculator or table.

To convert an angle in degrees to radians, multiply it by pi/180.

Answer 2

thanks we have a table but we have to fill it out ourselves and i wasn't sure how to do it.