$\lim_{x\to0}\left(\frac{-1+e^{\frac{x}{rc}}}{x}\right)$
$\frac{3}{x}+3$
$5\cdot7-4\cdot3$
$y\cdot\:\frac{dy}{dx}=y^2+1$
$-p^2-2p+3$
$5489+027$
$3x^3+5x^2+2x=0$
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