Classify critical points of x^3 - 3x

MediumCalculus~4m

For f(x)=x3−3xf(x)=x^3-3x, at which xx does ff have a local minimum?

Show hints (2)+
  1. Find critical points via f′=0f'=0.
  2. Use the sign of f′′=6xf''=6x.

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