$\frac{4}{x^2\left(x+2\right)}$
$\left(64x^6-27y^3\right)$
$\int\left(sen4x-1\right)^2dx$
$\left(2x^2+3x-2\right)^2$
$\left(3x^2-9x\right)\left(x^2-9\right)$
$-2x\le-20$
$\frac{3}{2}x\frac{4}{6}$
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