1/1-sinx + 1/1+sinx = 2 sec^2x
1/(1-sinx) + 1/(1+sinx) = 2 sec^2 x LS = (1 + sinx + 1 - sinx)/((1-sinx)(1+sinx)) = 2/(1-sin^2 x) = 2/cos^2 x = 2sec^2 x = RS
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