Task Let f: B(0) R be a function with the property that the partial derivatives of...

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Task Let f: B(0) R be a function with the property that the partial derivatives of f exist at all points af in B(0). Show that f is constant if and only if of = = 0 everywhere in B(0). Task Let f: B(0) R be a function with the property that the partial derivatives of f exist at all points af in B(0). Show that f is constant if and only if of = = 0 everywhere in B(0).