Posted by **Rudy** on Monday, October 29, 2012 at 2:31am.

1. For a differentiable function f, f' be the funcyion defined by f'(x) lim h->0 =f(x+h)-f(x-h)/(h)

a: Determine f'(x) for f(x)=x

b: Determine f'(x) for f(x)=x^2

- Calculus -
**Reiny**, Monday, October 29, 2012 at 8:53am
I will do the 2nd one, ....

f'(x) = lim ( (x+h)^2 - x^2 )/h , as h --> 0

= lim (x^2 + 2xh + h^2 - x^2)/h

= lim (2xh + h^2)/h , as h -->0

= lim 2x + h , as h --> 0

= 2x

for the 1st one, you should get 1

- Calculus -
**Rudy**, Tuesday, October 30, 2012 at 2:11am
Thanks ^.^

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