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