$\frac{dy}{dx}=\frac{1}{x}+\frac{1}{x^2}$
$-\left(x^2-x+1\right)\left(x^2+x-1\right)\left(x-2\right)$
$\frac{a^5b^9}{a^2b^3}$
$-15z^2f^3u^{-3}u^{-5}$
$\lim_{x\to2}\left(\frac{x^2-4}{1-\sqrt{x^2-3}}\right)$
$-2x+3\le-9-3x$
$2xy^2-y^2$
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