$\lim_{x\to0}\left(\frac{x^3+10x}{\arctan\left(2x\right)}\right)$
$-8a^2b\cdot3ab$
$\frac{16x^2-25}{4-5}$
$\left(x^2+2xy+y^2\right)dx+\left(2xy+x^2-1\right)dy=0$
$\frac{dy}{dx}=-y+4e^x$
$5x\cdot6x$
$\left(n^2+2n+4\right)x\left(n-2\right)$
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