Question: Prove that n (i) 2^n/2 cos =1 - C + C - C +.. n (ii) 22 sin =C- C3 + C-...., n being

Prove that n (i) 2^n/2 cos "=1 - "C + "C -

Prove that n (i) 2^n/2 cos "=1 - "C + "C - "C +.. n (ii) 22 sin ="C- "C3 + "C-...., n being a + ve integer. NR 4

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