Solution
Expression : $$\sqrt{[\frac{(1 - cosA)}{(1 + cosA)}}]$$
Multiplying both numerator and denominator by $$(\sqrt{1+cosA})$$
= $$\sqrt{[\frac{(1 - cosA)}{(1 + cosA)}}]$$ $$\times \sqrt{\frac{(1+cosA)}{(1+cosA)}}$$
= $$\sqrt{\frac{1-cos^2A}{(1+cosA)^2}} = \sqrt{\frac{sin^2A}{(1+cosA)^2}}$$
= $$\frac{sinA}{1+cosA}$$
=> Ans - (B)
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