Evaluate the integral. 3x cos 2x dx O e3x [2 sin 2x - 3 cos 2x] + C 13 O 1 [2 e3x sin 2x + 3 cos 2x] + C 13 O e3x [ sin 2x + cos 2x] + C O e3x [2 sin 2x + 3 cos 2x] + C 13

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