$\int\frac{r}{\left(h^2+r^2\right)^{\frac{3}{2}}}dr$
$j^2-4j-45=0$
$59\cdot49$
$12x+5y=-9$
$\frac{dx}{dy}=\frac{2x-xy}{1-x^2}$
$\frac{2}{9}x<7+x$
$a3-5a+1\:entre\:a+2$
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