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What is the difference between the words chord, tangent in (a) and (b)?
(a) If a function $g$ is continuous on the closed interval $[u,v]$, where $u<v$, and differentiable on the open interval $(u,v)$, then there exists a point $c$ in $(u,v)$ such that
$$g(v)=g(u)+g′(...
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