$\sqrt{9}^2$
$\frac{1+\frac{1}{x-1}}{1+\frac{1}{x^{2}-1}}$
$\frac{dy}{dt}=10y^2$
$\:-\:6\left[-\:3-\left(-6\:+\:9\right)\:+\:5\right]\:-\:8$
$3x\:+\:21x^2$
$\frac{2x+4}{x^2+4x+3}$
$v^2-18+81$
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