$\frac{2x^4-x^2}{2x^2+1}$
$x^2\frac{dy}{dx}=5x$
$3x+2y-3z+5w=-2$
$\lim_{z\to+0}\left(z\cdot\ln\left(z\right)\right)$
$\int\frac{2x^{2}+5x-9}{x-2}dx$
$\left(2x^5-5\right)^5$
$\int\left(\frac{1}{a}\right)dx$
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