$\frac{d^2}{dx^2}\left(9e^{-x^2}\right)$
$\int\left(15x^{-4}\right)dx$
$\left(3m-18\right)\left(m-7\right)$
$9^3+9+1$
$7x-2\left(x-5\right)=3\left(x+2\right)+2\left(x+2\right)$
$x\left(5x+6\right)$
$\lim_{x\to0}\left(\frac{x^4}{x^2+2x}\right)$
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