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Expression : $$(secA - tanA)^2$$
= $$(\frac{1}{cos A} - \frac{sin A}{cos A})^2$$
= $$(\frac{1 - sin A}{cos A})^2 = \frac{(1 - sin A)^2}{cos^2 A}$$
= $$\frac{(1 - sin A)^2}{1 - sin^2 A}$$
= $$\frac{(1 - sin A)^2}{(1 - sin A)(1 + sin A)}$$
= $$\frac{1 - sin A}{1 + sin A}$$
=> Ans - (C)
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