$\lim_{x\to e}\left(\frac{lnx}{17x-x^2-16}\right)$
$\frac{dy}{dx}=\frac{e^{x-y}}{1+e^x}$
$\:\frac{d^2y}{dx^2}=4x+3\:\:$
$\frac{1+cos\left(x\right)}{sin\left(x\right)}=\frac{\sin\left(x\right)}{1-cos\left(x\right)}$
$-9\:-7\:+6-1-2+4-1$
$\frac{x^2-2x+4}{x-6}$
$4m+8$
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