$\lim_{x\to-1}\left(\frac{x+1}{\sqrt{x^2+3}-2}\right)$
$\lim_{x\to a}\left(\frac{x^2+ax-2a^2}{x^2-a^2}\right),a>0$
$6=4+2u$
$7-3\cdot2+5$
$-2^2^2^2^2^2$
$\int\:-4\sqrt[3]{x}dx$
$\left|-11+35\right|$
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