If \( a=\cos \theta+i \sin \theta \), then \( \frac{1+a}{1-a}= \)
(A) \( \cot \frac{\theta}{2} \...
If \( a=\cos \theta+i \sin \theta \), then \( \frac{1+a}{1-a}= \)
(A) \( \cot \frac{\theta}{2} \)
(B) \( \cot \theta \)
(C) \( i \cot \frac{\theta}{2} \)
(D) \( i \tan \frac{\theta}{2} \)
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