$\left(2m-na2\right)^2$
$12+\left(-12\right)+\left[90\right]^2$
$4x-6=30$
$\lim_{x\to\infty}\left(\frac{x}{1-x}\right)$
$\lim_{x\to2}\left(\frac{x^2-x-12}{x-4}\right)$
$4+5x+10^2$
$y=\arccoth\left(\frac{a}{x}\right)+\ln\sqrt{\frac{x-a}{x+a}}$
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