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How to simplify sin3a*csca-cos3a*seca? ?
sin3a * csca-cos3a * seca = sin3a/Sina-cos3a/cosa

=(Sina cos2a-cosa Sina)/Sina-(cosa cos2a-Sina Sina 2a)/cosa

=(sinacos2a-2cos^2asina)/sina-(cosacos2a-2sin^2acosa)/cosa

=cos2a-2cos^2a-cos2a+2sin^2a

=2sin^2a-2cos^2a

=2cos2a

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