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Why does CosPi=-1?

katemarie13

by katemarie13 at March 15, 2012

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The point (cosine, sine) represents the values of the trig functions on the unit circle. The value of pi = 180 degrees at the point (-1,0) occurs in the second quadrant. It is here that we know that cosine of pi = -1 from the unit circle.

nycfunction nycfunction March 16, 2012

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