$\sqrt{9\left(-1\right)+18}$
$\lim_{x\to1}\left(8\cos\left(x\right)\right)$
$5+0.9$
$9^3+12$
$\frac{du}{dx}=\frac{2y}{x}$
$\left(x^4+4x^3y+6x^2y^2+4xy^3+y^4\right)$
$6a+2b+24c$
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