Using the substitution u=3xu = 3xu=3x, evaluate ∫sin(3x)dx\int \sin(3x) dx∫sin(3x)dx.
−cos(3x)+C-\cos(3x) + C−cos(3x)+C
−13cos(3x)+C-\frac{1}{3}\cos(3x) + C−31cos(3x)+C
13cos(3x)+C\frac{1}{3}\cos(3x) + C31cos(3x)+C
−3cos(3x)+C-3\cos(3x) + C−3cos(3x)+C