$\sqrt[3]{\left(a^3-ab^2\right)\left(a^2+2ab+b^2\right)}$
$x^2y^2-a^2y^2-b^2x^2+a^2b^2$
$\int_0^{\infty}x\:\frac{-1}{4}\:sen\:x\:dx$
$\left(8-11\right)-\left(3+1-4-6\right)$
$\left(x^2-2xy+y^2\right)^2$
$c=30+21\left(n-1\right)$
$\left(2a+b\right)\left(2a-b\right)-\left(2a+b\right)^2$
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