$x^2+8x-10\:-3x^2+5x+8\:-x^2+2xy+2$
$3x\cdot x^2-1$
$-ydx+xdy=0$
$\frac{d}{dx}\left(\frac{x-1}{x^2+5x+10}\right)$
$-26-\left(-14-20\right)+\left(2\right)$
$\frac{4n^4-7n^2+n^2}{2n+1}$
$\lim_{x\to0}\left(\frac{\sqrt{6+x}-\sqrt{6}}{x}\right)$
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