$\left(x^2-3y^3\right)^5$
$2\cos^2x=4$
$4\frac{x^3+7x+9}{2x+1}$
$9y^4-13y^2+4$
$\lim_{x\to0}\left(\frac{1-\cos\left(x^2\right)}{x^3}\right)$
$\frac{dy}{dx}\left(2x+3y=xy\right)$
$-7y^2+3y^2$
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