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