Prove tan^2 A / (tan^2 A - 1 ) + cosec^2 A / (sec^2 A - cosec^2 A) = 1 / ( 1 - 2cos^2 A)

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Prove tan^2 A / (tan^2 A - 1 ) + cosec^2 A / (sec^2 A - cosec^2 A) = 1 / ( 1 - 2cos^2 A)
Trigonometry class 10,
Trigonometry extra questions class 10,
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