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January 31, 2015

January 31, 2015

Posted by **will** on Wednesday, January 20, 2010 at 10:22am.

cos

- trig -
**bobpursley**, Wednesday, January 20, 2010 at 10:52amIsn't cosine negative in quadrant II?

memorize this:

Sin^2 X + Cos^2 X=1

find cosine X, you know sin X as 3/5

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