$\int\left(3-2x\right)\sqrt{4-x^2}dx$
$\lim_{x\to0}\left(\frac{2x^4-x^2}{x^2}\right)$
$\frac{d}{dx}\left(z^4-x^5y^7-1+x+y\right)=0$
$-81x^4+9$
$\left(4x^5-3z^2\:\right)^2$
$10x^2-27x+19$
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