$\int\frac{2x}{e^2}dx$
$\left(2x+1\right)^2-2\left(2x^2-1\right)$
$\frac{x^6-x^2-3}{x^2-3}$
$\int\left(\frac{y-3}{y^2}\right)dy$
$x+22<102-9x$
$\frac{64a^3-27b^3}{4a+3b}$
$\lim_{x\to1}\left(\frac{x^2-2x+2}{x^2-1}\right)$
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