Question: Let f: Rn R be a function such that | f (x) | |x|2 . Show that f is differentiable at 0

Let f: Rn →R be a function such that | f (x) | ≤ |x|2 . Show that f is differentiable at 0

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Calculus Early Transcendentals 9th Edition by James Stewart, Daniel K. Clegg, Saleem Watson, Lothar Redlin