Which set up is most useful in evaluating the integral √n-cos -cos (3x)] cos(3x)dx -cos (3x)] cos(3x)dx sin² (3x) cos(3x)dx and u = cos(3x) and = cos.x sin² (3x) cos(3x)dx u = cos(3x) and √sin sin² (3x) cos(3x)dx u = sin(3x) and

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