Question: (a) Compute the integral [ sin 3x.cos cos x dx in two ways: By using the substitution usinx. By using a trig identity and

(a) Compute the integral [ sin 3x.cos cos x dx in two ways: By using the substitution usinx. By using a trig identity and the substitution u = cosx. (b) How can you explain the different answers you got in part (a)?

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