$\frac{d^2}{dx^2}\left(\frac{1}{\cot\left(x\right)-1}\right)$
$\int\:\:x^3e^{-2x}dx$
$3\left(3a+5\right)+2$
$\left(2m-7\right)^2$
$-15y^4=\left(d\right)\left(3y^2\right)$
$25a^6-30a^3+9$
$-24.37+5.13$
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