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Mathematics 8 Online
OpenStudy (anonymous):

find the exact value of the trigonometric function: cos2pi/3

OpenStudy (anonymous):

This one should be memorized. -1/2

OpenStudy (anonymous):

If you are going to study trig, you have to know the values for sin and cos at the multiples of pi/6 and pi/4. You'v just gotta know them.

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