1+(secA-tanA)²/secA(cosecA-cotA)=2tanA
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2 tan A
= (sec^ A-tan^A)+(sec A - tan A^) / cosecA(sec A- tanA)
= (sec A + tan A)+(sec A - tan A) / cosecA
= 2sec A / cosec A
= 2 cos A / 1/sin A
= 2 tan A
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