$\frac{1}{x^2-1}-\frac{2}{x+1^2}$
$\left(2g+5u\right)\left(2m-5u\right)$
$9x^2-15$
$-416-239$
$\frac{1}{4}-\frac{x^2-1}{2}$
$\frac{dy}{dx}=-2x\left(y^2-3y+2\right)$
$9x^3\:-16xy^6$
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