Let f: R→R 2. Prove that f is differentiable

Let f: R→R 2. Prove that f is differentiable at a € R if and only if f 1 and f 2 are, and in this case
f 1(a) = ((f 1)1 (a) (f 2)1 (a)).
Copyright © 2019 SolutionInn All Rights Reserved