$4a^2-12a^2b^2+9a^2b^2$
$735-\left(-120\right)$
$\frac{x+19}{x^2-2x-15}$
$\int_1^{\infty}\left(\frac{\ln\left(t\right)}{t^2}\right)dt$
$\lim_{x\to\infty}\left(ex^{-x}\right)$
$3.5+1.3+7.2$
$\left(5x^2+9\right)\left(5x^2+9\right)$
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