Find the derivative of f(x)=e3xcos(2x)f(x) = e^{3x} \cos(2x)f(x)=e3xcos(2x).
e^{3x}(3 \cos 2x - 2 \sin 2x)
e^{3x}(3 \cos 2x + 2 \sin 2x)
e^{3x}(2 \cos 2x - 3 \sin 2x)
e^{3x}(\cos 2x - \sin 2x)