$\left(3a+1\right)\left(9a+1\right)$
$\int\left(\frac{2}{20+t}\right)dt$
$\left(+1\right)\left(-7\right)\left(-5\right)\left(+2\right)\left(-4\right)\left(-9\right)$
$x^2-32x-68$
$\lim_{x\to0}\left(\frac{-2\sqrt{x}-2}{e^{\sqrt{x}}}\right)$
$\left(\frac{1}{2}ax-2xy\right)^3$
$\frac{2y}{3x}+5e^x$
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