$-\sqrt{-9}$
$45\cdot\frac{7}{9}$
$7.\left(-48\right)$
$\int\left(\frac{\sqrt{y^2-1}}{y^3}\right)dy$
$7w^2u^4\cdot2w\cdot2u^6$
$\lim_{x\to\infty}\left(\frac{4x^2}{x^2+x-2}\right)$
$4x-12=3x$
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