Question: 3. Let f: R -> R be defined as f(x) := |x]|. Show that f is not differentiable at 0. Show that f is differentiable

3. Let f: R" -> R be defined as f(x) :=

3. Let f: R" -> R be defined as f(x) := |x]|. Show that f is not differentiable at 0. Show that f is differentiable for all x * 0, and find a formula for Vf(x) for x * 0. Hint: If you are having trouble, first solve this problem for n = 1. If you are having trouble with the n = 1 version, review Advanced Calculus

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