$x^3-x^2+2x^{-2}-5^2$
$n^2+10n+24$
$13+6t\ge1$
$\lim_{x\to0}\left(\frac{\frac{1}{\sqrt{a+x+7}}-\frac{1}{\sqrt{a+7}}}{x}\right)$
$\frac{x^{12}}{x^2}$
$\frac{1}{6}\cdot\left(x^3+6\right)^2$
$\left(\sqrt{x}\right)\left(\sqrt{x}\right)$
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