$\frac{r^8}{r^3}$
$\frac{4.326}{3}$
$4w^2+36wy+81y^2$
$\frac{\left(4x^{2}y+16x^{6}y+12x^{4}y^{2}\right)}{4x^{2}y}$
$\int\frac{x}{x^4+x^2}dx$
$2x^2-18x+36$
$\int sen\:\left(2x-4\right)dx$
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