$\frac{t}{1+t^3}$
$\frac{3x^2+2x}{x^3+x^2+1}$
$\int_0^{\infty}\left(3tx^2e^{-tx^3}\right)dx$
$\frac{d^9}{dx^9}\left(-x\:cos\left(x\right)\right)$
$5e^{5\infty}$
$\left(-8\right)^{-2}.\left(-8\right)^3$
$\sqrt{x}+3-1$
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