Last edited by anathema; Nov 6th 2008 at 01:37 AM.
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Originally Posted by anathema Consider the function $\displaystyle g$ defined by $\displaystyle g(x)=f(x)-x^3$, notice that $\displaystyle g$ is continuous, $\displaystyle g(-1)\geq 0$, $\displaystyle g(1)\leq 0$, and conclude.
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