26- If a- e i - - then -1- a- -1 a- is equal to -A- cot -2 -B- tan - -C- i cot -2 -D- i tan -2 -E- 2 tan -

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Properties Derived from Trigonometric Identities

26. If a= e i...

Question

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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