$\frac{\left(-1^n\right)\cdot\left(1+n\right)}{n^2}$
$40x\left(2250x^2\right)$
$-5\left(2g-7\right)$
$-\frac{1}{\left(\infty+1\right)^2}$
$\lim_{n\to0}x^n$
$3x^4\left(x^3-3\right)$
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