$\lim_{x\to1}\frac{x+1}{\left(\sqrt{x}-1\right)^2}$
$\sqrt[7]{\sqrt[3]{x^{18}}}$
$5cosx=4$
$x^3+8x^2+19x+12$
$30=10g-\:-20$
$\lim_{x\to\infty}\left(\left(\arctan\left(x\right)\right)\ln\left(x\right)\right)$
$\left(\frac{2}{5}x-\frac{2}{5}mx\right)^2$
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