$\int ln\left(r\right)\sqrt{r^7}dr$
$\frac{1}{2}ab^3c-\frac{3}{2}ab^3-ab^3c$
$\left(7xy+5x^2\right)\left(7xy-5x^2\right)$
$\frac{d}{dx}\left(x^2+2xy^2-4xy=5\right)$
$\left(3m^2-8n^4\right)^2$
$-\left(\frac{\frac{x}{x^2+y^2}}{\frac{y}{x^2+y^2}}\right)$
$-x^2+6x+3^2$
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