$\int_{-\infty}^6re^{\frac{r}{2}}dr$
$4abc+8bac+abc+2abc$
$-805+94$
$\left(2x+3y+4\right)\left(2x+3y-1\right)$
$2\sqrt{13}sin\left(x-56.3\right)=3$
$\frac{\pi^2}{\pi^2}$
$\left(5x^2\right)^1$
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