$\lim_{t\to\infty}\left(\frac{10t}{t^2+1}\right)$
$z^2-18z=-41$
$\frac{d}{dx}\frac{x^2}{e^x}$
$7x^2+19x-6=0$
$\left(x^2+4x+4\right)-\left(x^2-1\right)$
$\int\frac{x}{\left(1-2x\right)\left(x^2+1\right)}dx$
$37\cdot20+6$
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