prove LHS equals to RHS
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sin^2A/cos^2A - sin^2B/ cos^2B
sin^Acos^2B - cos^2Asin^2b / cos^2Acos^2B
sin^2A(1-sin^2B) - sin^2B(1-sin^2a) / cos^2Acos^2B
sin2A - sin2Asin2B - sin2B +sin2Asin2B / cos2Acos2B
sin2A- sin2B / cos2Acos2b
sin^Acos^2B - cos^2Asin^2b / cos^2Acos^2B
sin^2A(1-sin^2B) - sin^2B(1-sin^2a) / cos^2Acos^2B
sin2A - sin2Asin2B - sin2B +sin2Asin2B / cos2Acos2B
sin2A- sin2B / cos2Acos2b
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