The function f is differentiable at a. Find

I'd assume its something to do with manipulating the definition but have no idea how.

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- February 4th 2010, 12:30 PMvuze88Harder limits
The function f is differentiable at a. Find

I'd assume its something to do with manipulating the definition but have no idea how. - February 4th 2010, 05:49 PMfelper
- February 4th 2010, 07:23 PMvuze88
so is the answer

- February 5th 2010, 06:15 AMfelper