$\frac{1}{x-1}+\frac{1}{x+2}$
$\int_0^{\infty}\left(\frac{e^x}{\left(1+e^x\right)}\right)dx$
$\int\left(3sin\left(4x\right)\right)dx$
$\left(x^2+y^2\right)\cdot\left(-2yx\right)-\left(2xy\right)\cdot\left(y^2+x^2\right)$
$\left(x+20\right)\left(x-20\right)+400$
$\left(3\:-\:a\right)2\:$
$-4\:\left(2\right)\left(-5\right)$
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