$\left(g-2\right)\left(g^2+4\right)+\left(g+2\right)\left(g^2-4\right)$
$\lim_{x\to0}\left(\frac{e^2-1}{e^{2x}-1}\right)$
$4+2-x$
$\frac{x-3}{4}=5$
$\lim_{x\to\infty}\left(\frac{19e^{\sqrt{\ln\left(x\right)}}}{\sqrt{x}}\right)$
$\sin^2\:\arccot\left(a\right)$
$f\left(x\right)=\frac{-2}{x^2}+7$
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