$\frac{e^x}{e^{-2x}}$
$4x^2+88x+121$
$3z^2+32z+20$
$\lim_{a\to3}\left(\frac{a^{3}-3a^{2}-a+3}{a^{2}-2a-3}\right)$
$\sqrt{36},\:\sqrt{20}$
$\int6cos^4xdx$
$\int^3\sqrt{t}\left(5t^2-3t+2\right)dx$
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