$-2x+9x-x$
$\int\frac{1-x+2x^2-x^3}{x\left(x^2+1\right)^2}\:dx$
$5x^2-10x+3$
$2x+1\le3x+6$
$\lim_{x\to\infty}\left(\frac{-3x^2-2x-8}{3x-4}\right)$
$\frac{x^4-y^{10}}{3x^2+3y^5}$
$\frac{dy}{dx}=\frac{xe^x}{4y}$
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