$x^2-2x-15>0$
$3\sin^2x-\sin x-4$
$\int_{\infty}^{11}\left(\frac{x}{x^2-4}\right)dx$
$\int x\cdot sen18xdx$
$13n-26$
$\int\frac{r}{\left(h^2+r^2\right)^{\frac{3}{2}}}dx$
$-21-\left(20\right)+\left(-1\right)$
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