$\int\frac{-x^2+8}{x^2-2x-35}dx$
$\int\left(25x^4\right)dx$
$\left(x^2+2z+4\right)^2$
$\lim_{x\to0}\left(arctan\left(2x\right)x^2\right)$
$36x^2+24x+4$
$\int\frac{\sen^{3}x-\sen^{5}x}{\sen^{2}x\cos^{2}x}dx$
$\left(-6\right)x\left(+22\right)$
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