$\frac{x^n}{\left(n+1\right)\cdot\:\left(n+2\right)}$
$-\left(-1-\left(-6+5\right)\cdot5\right)$
$\int x^2e^xdt$
$m^2-1=0$
$\left(6z^2+7z^3\right)+\left(5z^3-3z^4+4z^2\right)$
$6\cdot10^3$
$\left(12a^3-5\right)^2$
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