$56^2-49^2$
$-3x\le12$
$7x+7y$
$\frac{\frac{1}{2}}{\frac{1}{\infty}}$
$\int\:\frac{3t^2+t+4}{t^3+t}dt$
$x'=e^t-\frac{2t}{t^2-1}$
$1\cdot\left(-1-2\right)$
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