$\left(b^2+x\right)\left(b^3+x\right)$
$\frac{d}{dx}\left(xln\left(y-x\right)\right)$
$\frac { 2 + 2 } { 4 }$
$-4.5+8$
$\lim_{x\to0}\left(\frac{arctan\left(4x\right)}{x}\right)$
$1+\frac{1}{1}$
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