Prove the identities: (1 + (secA - tanA)^2)/(cosecA(secA - tanA)) = 2tanA
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{1+(secA-tanA)²}/cosecA(secA-tanA)
={(sec²A-tan²A)+(secA-tanA)²}/cosecA(secA-tanA)
={(secA-tanA)(secA+tanA+secA-tanA)}/cosecA(secA-tanA)
=2secA/cosecA
=2sinA/cosA
=2tanA
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