Simplifying
$1x^2-81$
$\int_0^{\infty}\left(\frac{1}{1+x^2}-\frac{4}{3x+1}\right)dx$
$\frac{d}{dx}\left(e^x+e^y\right)$
$\frac{x^2+4}{2x-2}$
$y^3-x^2+1=0$
$\lim_{x\to\infty}\left(\frac{6x-\cos\left(x\right)}{x}\right)$
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