equations trig
posted by LiNnda .
1) ctgx+cosx=1+ctgx*cosx
2) sin^4x+cos^4x=1/2
3) (sinxcosx)^2=sin2x
4) sin^4xcos^4x=7/2(sinxcosx)
5) sin^2xsinxcosx+cosxsinx=0
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