Posted by **mariya** on Monday, February 4, 2008 at 7:02pm.

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?

- trigonometry -
**drwls**, Monday, February 4, 2008 at 8:26pm
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.

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