- #1

B3NR4Y

Gold Member

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## Homework Statement

I and J are open subsets of the real line. The function f takes I to J, and the function g take J to R. The functions are in C

^{1}. Use the mean value theorem to prove the chain rule.

## Homework Equations

(g o f)' (x) = g'(f (x)) f'(x)

MVT

## The Attempt at a Solution

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I know that the open interval (a

_{n}, x) is a subset of J.

Therefore I can apply the mean value theorem, but I have no clue where to go