3. Show thatcos 0 + cos ¢ [|वि = cot| ——sin 0 + sin ¢ 2(i) – InterviewSolution

1.	3. Show thatcos 0 + cos ¢ [\|वि = cot\| ——sin 0 + sin ¢ 2(i)
Answer» (cost+cosu)/(sint+sinu) = (2cos(t+u)/2 cos(t-u)/2) /(2sin(t+u)/2 2cos(t-u)/2 ) = cot(t+u)/2

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