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July 28, 2015

Homework Help: Trigonometry

Posted by Sam on Sunday, December 20, 2009 at 8:22pm.

Evaluate the sine, cosine and tangent of -7pi/3. I got 1/2, sq. root of 3/2 and sq. root of three. My book says the sine and the tangent are negative, but I don't know why? Can you explain the rule??

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