$\frac{3x}{3x^2-3}$
$-\frac{385}{-55}$
$21mx+49my-63mz$
$7mn^2\sqrt[3]{28c^2}$
$12a+24$
$\lim_{x\to0}\left(\frac{\sqrt{3x-2}-\sqrt{2x}}{x-2}\right)$
$\frac{\left(1+\sin\left(x\right)\right)^2}{\cos^2x}=\frac{1+\sin\left(x\right)}{1-\sin\left(x\right)}$
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