- #1
terryds
- 392
- 13
Homework Statement
If ##\lim_{x\rightarrow a} \frac{f(x^3)-f(a^3)}{x-a} = -1##.
then f'(1) = ...
A. -1
B. -1/3
C. 1/3
D. 1
E. 2
Homework Equations
[/B]
##f'(x) = \lim_{h->0}\frac{f(x+h)-f(x))}{h}##
The Attempt at a Solution
[/B]
I really have no idea about this problem.
Please help me.