7. Let f be continuous on [a, b] and g(x) =
, a ≤ x ≤ b. Prove or disprove that g is differentiable on (a, b).
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7. Let f be continuous on [a, b] and g(x) =, a ≤ x ≤ b. Prove or disprove that g is differentiable on (a, b).