$6a^3b+18a^2b^2+30ab^3$
$46-\left(38-\left(-2\right)+-9+\left(42-18+-15\right)-\left(-7\right)\right)$
$\lim_{x\to1}\left(\frac{x^3-4x+3}{x-1}\right)$
$\lim_{x\to x}\left(\frac{\tan\left(x\right)-\left(x\right)}{x-\sin\left(x\right)}\right)$
$x^2+2\ge0$
$\lim_{x\to0}\left(\sqrt{x^3-x}\right)$
$\frac{2x^3}{x^1}$
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