$\int\frac{\sqrt{r}}{1+r}dr$
$\left(x^2\:+\:1\right)\:\:dx\:+\:\left(x^2\:y^2\right)\:\:dy\:=\:0$
$e=ax+by+ay+bx$
$\cos^{2}\alpha=-\sen\alpha+1$
$-\frac{3x}{3x^2-3}$
$\int\left(18x^2-25x^4+3x^2\right)dx$
$4n^4-12n^2+9$
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