$\lim_{x\to0}\left(\frac{\sin\left(x\right)}{e^2-e}\right)$
$\csc^2\left(x\right)+\csc\left(x\right)=2$
$\frac{x+1}{3}\le5$
$\left(12+5\right)\cdot3$
$\left(x^{-2}+y^{-3}\right)\left(x^{-3}-y^{-3}\right)$
$x\sqrt{4-y^2}dx+\sqrt{x^2+3}dy=0$
$\lim_{x\to\infty}2x-3lnx$
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