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OpenStudy (anonymous):
prove identity of (sinx)(cotx+cosxtanx)=cosx + (sin^2)x
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OpenStudy (mathmale):
There is an identity for sin(2x). Please find it and write it out on the right side of your equation. Compare the left and right sides.
OpenStudy (anonymous):
it is 1-(cos^2)x , I still don't know what to do after @mathmale
OpenStudy (poisoned_ruby):
You can set cotx as cosx/sinx
OpenStudy (poisoned_ruby):
And tanx as sinx/cosx
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