$y\:=\frac{x}{2}+\frac{1}{x}$
$\lim_{x\to2}\left(\frac{2x^3-6}{x-x^2}\right)$
$\sqrt[4]{625\cdot81}$
$x2-5x+18$
$\frac{d}{dx}\:\frac{1}{x^2+9x}$
$a-3b+5c-5a+8b-5c+11a-b+c$
$36x^3-81$
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