If f(x)=x3−3xf(x) = x^3 - 3xf(x)=x3−3x, find the range of fff on the interval [−1,2][-1, 2][−1,2].
[−2,2][-2, 2][−2,2]
[−2,3][-2, 3][−2,3]
[−1,2][-1, 2][−1,2]
[0,2][0, 2][0,2]