What is the derivative of f(x)=sin(3x)f(x) = \sin(3x)f(x)=sin(3x)?
3cos(3x)3\cos(3x)3cos(3x)
cos(3x)\cos(3x)cos(3x)
−3cos(3x)-3\cos(3x)−3cos(3x)
3sin(x)3\sin(x)3sin(x)