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26. If a= e i θ , then (1+ a) /(1 a) is equal to (A) cot θ/2 (B) tan θ (C) i cot θ/2 (D) i tan θ/2 (E) 2 tan θ

Answer» 26. If a= e i θ , then (1+ a) /(1 a) is equal to (A) cot θ/2 (B) tan θ (C) i cot θ/2 (D) i tan θ/2 (E) 2 tan θ


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