Hello,

You know that (lim h to 0)(a) Show that

lim as h-->0: [f(x+h)-f(x-h)]/2h = f '(x)

If you substitute h for -h, you have :

(lim h to 0)

Now, add the two boxed equations term by term

The best to do is to show what you've done, it will be easier to point out your mistakes1) Limit as x-->1- (from the right) of: sqrt(1-x^2) / sqrt(1-x^3)

(I know that I need to apply L'Hopital's rule here, maybe even twice, but I keep getting the wrong answer. Thanks in advance if you can help!)