$\int_0^{\infty}xe^{-e}dx$
$\left(3a-b\right)^2+3\left(a+b\right)^2$
$a^6-3a^4+8a^3-4a^3$
$\int\left(\frac{x}{\sqrt[2]{x^2-5}}\right)dx$
$4x-2+x-2+x+5+3x+5+2x-4$
$x^2+x-21$
$5x\:+\:3x\:-\:6x\:$
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