Question 1164065: Use the unit circle and your knowledge of special triangles to find exact values for sin 240 and cos 240. Then use a calculator to check your answers. Notice that calculators use parentheses around the 240 because sin and cos are functions. In text, except where the parentheses are required for clarity, they are often left out.
Answer by ikleyn(52900)   (Show Source):
You can put this solution on YOUR website! .
The question is addressed to you, not to me.
Therefore, it is assumed that YOU will answer it --- not me.
NEVERTHELESS, to help you, I post these two links to you
https://en.wikipedia.org/wiki/Unit_circle
https://en.wikipedia.org/wiki/Unit_circle#/media/File:Unit_circle_angles_color.svg
Look in it and have fan !
Happy learning (!)
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