1+(secA-tanA)²/cosecA(secA-tanA)=2tanA
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1 + (sec^2 A - 2secA tanA + tan^2 A) / cosecA ( secA - tanA) =
(1 + tan^2 A) + sec^2 A - 2secA tanA / cosecA ( secA - tanA) =
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