If \( C^{2}+S^{2}=1 \), then \( \frac{1+C+i S}{1+C-i S} \) is equal to (A) \( C+i S \) (B) \( C-...

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If \( C^{2}+S^{2}=1 \), then \( \frac{1+C+i S}{1+C-i S} \) is equal to
(A) \( C+i S \)
(B) \( C-i S \)
(C) \( S+i C \)
(D) \( S-i C \)
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