$\int\left(x\left(x-20\right)^5\right)dx$
$\int\left(4\right)\left(\pi\right)dx$
$\int2xsen3xdx$
$4\:x\:2\:-\:81\:y\:2$
$xsen\left(y\right)dy=x^2cos\left(y\right)dx\:$
$\sqrt{4x^2y^4}$
$a^2-a-1$
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