let $f(x)$ be polynomial of degree 6 in $x$, in which the coefficient of $x^6$ is unity and it has extrema at $x=-1$ and $x=$
1. If $\lim _{x \rightarrow 0} \frac{f(x)}{x^3}=1$, then $5 \cdot f(2)$ is equal to $\_\_\_\_$ .
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