$3-9+4-8-2+13$
$9x-3\left(x+1\right)^2+9$
$\pi\pi\pi$
$\frac{dy}{dx}=4xe^{-5y}$
$\left(-1+1\right)^n$
$\int\frac{x-1}{x\left(x^2+2x\right)}dx$
$\left(4x-\frac{3}{5}\right)\left(4x+\frac{3}{4}\right)$
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