Suppose that $f(x)$ is continuous on $[a, b]$ and that $f(x) geq c > 0$ for some constant $c$. Prove that $1/f(x)$ is continuous on $[a, b]$.
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Suppose that $f(x)$ is continuous on $[a, b]$ and that $f(x) geq c > 0$ for some constant $c$. Prove that $1/f(x)$ is continuous on $[a, b]$.