Prove that : cot^2 A cosec^2 B - cot^2 B cosec^2 A = cot^2 A - cot^2 B

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Prove that : cot^2 A cosec^2 B - cot^2 B cosec^2 A = cot^2 A - cot^2 B

Prove that : cot^2 A cosec^2 B - cot^2 B cosec^2 A = cot^2 A - cot^2 B