tan^2A - sin^2A = tan^2A * sin^2A
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tan^2A - sin^2 A = tan^2A sin^2A
sin^2A/cos^2A - sin^2A
sin^2A - sin^2 cos^2/cos^2A
sin^2A(1-cos^2A)/cos^2A
sin^2A sin^2A /cos^2A
sin^2A/cos^2A sin^2A
tan^2A sin^2A
hence proved RHS=LHS
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