prove that
(secA + tanA)^2 - 1/(secA+tanA)^2 +1
= sinA
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so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so sorry but I don't know so sorry
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