$\frac{d}{dx}\left(\:x^2-xy+y^3=8\right)$
$\lim_{x\to0}\left(\frac{\sqrt{x-9}}{x-81}\right)$
$\int\:\frac{1}{x^2-5}dx$
$2tanx\:-\:3\:=\:-5$
$\int\left(ycos^2y\right)dy$
$\frac{a^6-b^2}{a^6-b^2}$
$-3x\cdot4y$
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