In In = (a) Prove the reduction formulae 1 -- sinn-1 x cos x + n (HINT: Use integration by parts where u = sin x). (b) Prove that - [sin" zdr. n-1 n -In-2 Io = x +C; I₁ = cos x + C. (c) Use the reduction formula in (a) to evaluate 16 and 17.

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