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Expression : cosA/(1 - sinA) = x
Multiplying both numerator and denominator by $$(1+sinA)$$
= $$\frac{cosA}{1-sinA} \times \frac{(1+sinA)}{(1+sinA)}$$
= $$\frac{cosA(1+sinA)}{1-sin^2A} = \frac{cosA(1+sinA)}{cos^2A}$$
= $$\frac{1+sinA}{cosA} = (\frac{1}{cosA}+\frac{sinA}{cosA})$$
= $$secA+tanA$$
=> Ans - (C)
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