$3z^2+18z$
$\left(e^t\right)^2+\left(e^{-t}\right)^2$
$64x^3+8y^6$
$\int\cos\left(x\right)\:dx$
$6u-3=-5\left(u+5\right)$
$2m+7mn^2$
$\left(a-2\right)^4$
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