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= ((1 + sinx)/cosx)^2
= ((1 + sinx)(1 + sinx)/(cos^2 x))
= ((1 + sinx)(1 + sinx)/(1 - sin^2 x))
= ((1 + sinx)(1 + sinx)/(1 + sinx)(1 - sinx))
= (1 + sinx)/(1 - sinx)
Q.E.D.