$\frac{n^2}{9}+2mn+9m$
$\int\cos\left(e^{-x}\right)\cdot e^{-2x}dx$
$\frac{2x^2}{x^2}$
$\int\left(1+x^2\right)^{\frac{3}{2}}\left(\frac{1}{\sqrt{1+x^2}}\right)dx$
$-4n-8=4\left(-3n+2\right)$
$\left(2\sqrt{5}+5\right)\left(2\sqrt{5}-5\right)$
$\frac{dy}{dx}-x^2+1=0$
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