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prove that sin^2A/cos^2A+cos^2A/sin^2A-1/sin^2A.cos^2A=-2

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Prove that   sin2A/cos2A + cos2A/sin2A - 1/sin2A.cos2A = -2

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by (7.2k points)

To prove: sin2A/cos2A + cos2A/sin2A = 1/sin2A.cos2A - 2

LHS

which is equal to RHS

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