$f(x)$ must be continuous on the closed interval $[4, 6]$.
2. $f(x)$ must be differentiable on the open interval $(4, 6)$.
3. $f(a) = f(b)$, where $a=4$ and $b=6$.
First, let's check the continuity. The function $f(x)$ is a rational function, which is continuous
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