$\frac{\left(-1\right)^n\left(x-3\right)^n}{4^n\left(n+1\right)}$
$\left(-m-25\right)\left(_{-m+25}\right)$
$\left(1-x^2\right)^{-0.5}$
$6n^2+n-2$
$\left(\sqrt{x+1}-2\right)x\:\left(\sqrt{x+1}+2\right)$
$\frac{x^2}{4}\cdot x$
$\frac{x^2+2x+1}{-x+1}$
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