$-\frac{2}{3}-\frac{1}{3}$
$x\:-\:10\:<13$
$-23-\left(-12-19\right)$
$\left(4mn\right)\left(3m\right)\left(7n\right)\left(9mn\right)$
$\cot^2\left(\frac{x}{2}\right)+\csc\left(\frac{x}{2}\right)=1$
$\frac{dy}{dx}=\frac{-1}{10}\sqrt{x}$
$-\left(-3\right)+\sqrt{\left(-1\right)^2-4\left(2\right)\left(-3\right)}$
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