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√[(1-sinA)/(1+sinA)]=secA-tanA
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\[\sqrt{\frac{(1-sinA)}{(1+sinA)}} \]\[= \sqrt{\frac{(1-sinA)(1-sinA)}{(1+sinA)(1-sinA)}} \]\[=\sqrt{\frac{(1-sinA)^2}{(1-sin^2A)}} \]\[=\sqrt{\frac{(1-sinA)^2}{(cos^2A)}} \]\[=\frac{(1-sinA)}{(cosA)} \]\[=\frac{1}{cosA}-\frac{sinA}{cosA} \]\[=secA-tanA\]
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