sin^2 3A(1-sin^2 A)-cos^2 3A sin^2 A=sin^2 3A-sin^2 A(cos^2 3A sin^2 3A)sin^2 3A(1-sin^2 A)-cos^2 3A sin^2 A=sin^2 3A-sin^2 A(cos^2 3A sin^2 3A)

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