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July 3, 2015

Homework Help: equations trig

Posted by LiNnda on Thursday, May 6, 2010 at 8:02am.

1) ctgx+cosx=1+ctgx*cosx

2) sin^4x+cos^4x=1/2

3) (sinx-cosx)^2=sin2x

4) sin^4x-cos^4x=7/2(sinxcosx)

5) sin^2x-sinxcosx+cosx-sinx=0

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