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October 1, 2014

October 1, 2014

Posted by **Harley** on Thursday, February 23, 2012 at 9:47am.

- trig -
**MathMate**, Thursday, February 23, 2012 at 10:01amUse sin²(x)+cos²(x)=1

and the fact that cos(x) in the second quadrant is negative does not change the value of cos²(x).

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