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Prove that $f(x)=x^2$ decreases on the interval $(-\infty,0]$ and increases on the interval $[0,\infty)$.
Prove that $f(x)=x^3$ increases everywhere.
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Lesson Specific Problems
Prove that $f(x)=x^2$ decreases on the interval $(-\infty,0]$ and increases on the interval $[0,\infty)$.
Prove that $f(x)=x^3$ increases everywhere.
