$4+\frac{2}{u}-\frac{3u}{u+5}$
$\int_0^{\frac{\pi}{3}}\left(\frac{\sin\left(x\right)}{\cos^2\left(x\right)}\right)dx$
$x^2-9x=-20$
$\left(3x+1\right)\frac{dy}{dx}=y+2$
$\int\:\:e^{-2x^2}dx$
$\lim_{x\to0}\left(5x^3+4x^2-x\right)$
$\left(a+x\right)\left(x+a\right)$
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