Im trying to prove function defined by is differentiable everywhere in using derivative as a limit

Is this asking me to use first principles to show this?

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- April 21st 2010, 03:38 AMpigletIs the first principles?
Im trying to prove function defined by is differentiable everywhere in using derivative as a limit

Is this asking me to use first principles to show this?

- April 21st 2010, 03:42 AMundefined
- April 21st 2010, 04:41 AMHallsofIvy
Yes, show that exists.