$2\left(-6+2\right)$
$x^2+5\le0$
$\int_a^{\infty}\left(\frac{1}{x\ln\left(x\right)^2}\right)dx$
$\lim_{x\to\pi}\left(\frac{cos\left(7\pi\right)}{x-\pi}\right)$
$3x+7\le25$
$\int\frac{x^2-2x-1}{x^3+3x}dx$
$\frac{21}{0.37}$
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