Evaluate ∫ x cos 3x dx. a. 1/3 x sin 3x + 1/9 cos 3x + c b. 1/3 x sin 3x - 1/3 sin 3x + c c. 1/2 x2 + 1/18 sin2 3x + c d. 1/6 x2 sin 3x + c

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