$\left(4r-5\right)\left(4r+5\right)$
$169x^2+260xy+44x$
$\left(x^3-2x^2+9\right)\left(x+2\right)$
$\int_0^{10}\left(22.0xe^{-0.110x}\right)dx$
$49h^2w^2-9x^6y^{14}$
$\lim_{x\to-1}\left(\frac{7x^3+7}{3x^2+7x+4}\right)$
$\frac{dy}{dx}=-\left(\frac{y}{x}+1\right)$
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