Perform the following integration. If a u-substitution is needed, indicate the choice for u. S sin“ 3æ cos 3a dæ O u = sin* 3a, sinº 3æ + C u = cos 3æ, sin® 3æ + C * 15 O u = sin 3æ, sin° 3a + C O u = 3æ, sin° a + C O u = sin* 3x, cos 3æ + C

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