$\lim_{x\to\infty}\frac{x\left(\sqrt{x^2-1}-x-1\right)}{x+1}$
$x+3>5$
$\lim_{x\to1}\left(e^{\left(-\frac{1}{\left(1-x\right)^2}\right)}\right)$
$f\left(x\right)=5\left(x^2+3x-2\right)-\left(2x+4\right)^2$
$56.785:\:5\:\:$
$\int\frac{1}{cos\:2x}dx$
$4x^2+4x-5$
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