Let g : R → R be differentiable at a point xo and define f : R → R by f (x) = xg(x). Using the definition of the derivative, prove that f is differen- tiable at ro and that f'(xo) = xog'(xo)+ g(xo). (NB: You are not allowed to use any Rules of Differentiation, such as the Prod- uct Rule. You are allowed to use Limit Rules from Chapter 3 in Notes/Ross.)

Advanced Engineering Mathematics
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Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Let g : R → R be differentiable at a point xo and define f : R → R by
f (x) = xg(x). Using the definition of the derivative, prove that f is differen-
tiable at xo and that f'(xo) = xog'(xo)+ g(xo).
(NB: You are not allowed to use any Rules of Differentiation, such as the Prod-
uct Rule. You are allowed to use Limit Rules from Chapter 3 in Notes/Ross.)
Transcribed Image Text:Let g : R → R be differentiable at a point xo and define f : R → R by f (x) = xg(x). Using the definition of the derivative, prove that f is differen- tiable at xo and that f'(xo) = xog'(xo)+ g(xo). (NB: You are not allowed to use any Rules of Differentiation, such as the Prod- uct Rule. You are allowed to use Limit Rules from Chapter 3 in Notes/Ross.)
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