Let $f(x)$ be a polynomial of degree 5 , and have extrema at $x=1$ and $x=-1$. If $\lim _{x \rightarrow 0}\left(\frac{f(x)}{x^3}\right)=-5$, then $f(2)-f(-2)$ is equal to :Let $f(x)$ be a polynomial of degree 5 , and have extrema at $x=1$ and $x=-1$. If $\lim _{x \rightarrow 0}\left(\frac{f(x)}{x^3}\right)=-5$, then $f(2)-f(-2)$ is equal to :
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