Find f′(x)f'(x)f′(x) for f(x)=cos(x3)f(x) = \cos(x^3)f(x)=cos(x3).
−3x2sin(x3)-3x^2 \sin(x^3)−3x2sin(x3)
3x2sin(x3)3x^2 \sin(x^3)3x2sin(x3)
−sin(x3)-\sin(x^3)−sin(x3)
3x2cos(x3)3x^2 \cos(x^3)3x2cos(x3)