$\int\left(\frac{2t^3+1}{\left(t^4+2t\right)^3}\right)dt$
$x^2y+x^2z$
$20^4-60^3+45f^2$
$3\left(3x^{2\:}-2x+1\right)$
$\left(+9.3\right)+\left(-3.1\right)$
$\left(-3mn\right)\left(m^2-2mn-3n^2\right)$
$5\:x\:7\:-\:\frac{4^2}{2}$
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