Question: If |(w) - (x)| |w - x| for all values w and x and is a differentiable function, show that -1 (x)

If |ƒ(w) - ƒ(x)| ≤ |w - x| for all values w and x and ƒ is a differentiable function, show that -1 ≤ ƒ′(x) ≤ 1 for all x-values.

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