Posted by **Jillian** on Friday, December 9, 2011 at 2:10pm.

Calculate the exact values of sin(theta) cos(theta) and tan (theta) when theta=240 degrees.

How would I do this with and without a calculator?

- Calc -
**Steve**, Friday, December 9, 2011 at 3:09pm
Learn your standard angles in their various orientation around the circle.

0 pi/6 pi/4 pi/3 and pi/2 are important enough to memorize

In degrees, that's 0 30 45 60 90

240 = 180 + 60

so it's in the 3rd quadrant.

Use the functions of 60 degrees, except that sin and cos are both negative there.

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