$\left(18x^7y^{-4}z\right)^{-2}$
$-12\cdot132$
$\left(a+2\right)\left(a-1\right)$
$\lim_{x\to\infty}\left(1+\frac{3}{x}\right)^{\frac{x}{9}}$
$\lim_{x\to0}\:\:a^xlna-b^xlnb$
$a^2-a x^2$
$\frac{d}{dx}\left(7x^{4x}\right)$
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