Solution
Expression : secA - tanA = x
= $$\frac{1}{cosA}-\frac{sinA}{cosA}$$
= $$\frac{1-sinA}{cosA} = \frac{\sqrt{(1-sinA)^2}}{\sqrt{1-sin^2A}}$$
= $$\sqrt{\frac{(1-sinA)^2}{(1-sinA)(1+sinA)}}$$
= $$\sqrt{\frac{1-sinA}{1+sinA}}$$
=> Ans - (B)
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