$x^2+3x+21=22$
$\lim_{x\to\infty}\left(9xtan\left(\frac{8}{x}\right)\right)$
$\frac{\sqrt[2]{1}}{4}a^2$
$a\left(b+7\right)$
$\frac{d}{dx}\:x^2-3x-3x^{-2}$
$\int x\sqrt{\left(x+1\right)}\cdot ln\left(x+1\right)dx$
$\lim_{x\to0}\frac{x^3-3x^{2-5x}}{x^2-7x}$
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