Question: 3. (i) Using the reduction formula, show that if I = x cosx dx, then x cosx dx = x sin x + nxn

3. (i) Using the reduction formula, show that if I = x" cosx dx, then x" cosx dx = x sin x + nxn 1 cosx n(n 1) 2 - 1)In-2 (ii) Hence evaluate x cos x dx

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