\[ \frac{\sin 2 A}{1+\cos 2 A} \frac{\cos A}{1+\cos A}= \] \( \math...

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\[
\frac{\sin 2 A}{1+\cos 2 A} \frac{\cos A}{1+\cos A}=
\]
\( \mathrm{P} \)
(1) \( \tan \frac{A}{2} \)
(2) \( \cot \frac{A}{2} \)
(3) \( \sec \frac{A}{2} \)
(4) \( \operatorname{cosec} \frac{A}{2} \)
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