- #1
courtrigrad
- 1,236
- 2
Why is it that if you have [tex] \frac{f(x_1) - f(x_2)}{x_1-x_2} = f'(\xi) [/tex] then [tex] \xi = x_1 + \theta(x_2-x_1) [/tex] where [tex] 0<\theta<1 [/tex]?
Thanks
Thanks