1+secA/secA=1-sin²A/cosA
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LHS = (1 + 1/cosA) / 1/cosA
= (cosA + 1) /cosA / 1/cosA
= (cosA + 1) * (cosA - 1)/(cosA - 1)
= -sin^2(A)/(cosA - 1)
= sin^2(A) / (1 - cosA) = RHS
= (cosA + 1) /cosA / 1/cosA
= (cosA + 1) * (cosA - 1)/(cosA - 1)
= -sin^2(A)/(cosA - 1)
= sin^2(A) / (1 - cosA) = RHS
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