$\lim_{x\to-\infty}\left(x^{-3}e^x\right)$
$\lim_{x\to\infty}\left(\frac{\sqrt{x+2}-\sqrt[3]{x+20}}{\sqrt[4]{x+9}-2}\right)$
$\frac{5x^4+9}{x}$
$\left(2+y^2\right)dt+tydy=0$
$+4-23$
$x^2+1\le4x-3$
$s^2+4s+6$
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