$x^2+8x=9$
$\left(31\right)^2-4\left(5\right)\left(-22\right)$
$\cos\left(180+x\right)=-\cos x$
$\int_1^{\infty}\left(\frac{ln\left(x\right)}{x^{-1}}\right)dx$
$t+ye^{-t}y'=0$
$104^4$
$9mn+12m-2mn$
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