Nth derivative

• April 6th 2008, 10:41 PM
Mathstud28
Nth derivative
is there any other way of computing the nth deriviative of $f(g(x))$ besides Faa di Bruno's formula?
• April 7th 2008, 12:02 AM
Moo
Hello,

As far as i can see, i find Faa di Bruno's formula indigest :D
Especially because it's just an interpretation of the general chain rule... So his would be the one you have to use.
D'you have a particular function you want to get the nth derivative ?
• April 7th 2008, 04:32 AM
colby2152
As Moo said, the rule is just offspring of the all mighty Chain Rule.
• April 7th 2008, 08:24 AM
Mathstud28
No
it just came up in a "proof" of sorts and I needed a good substitution for $f(g(x))^{(n)}$
• April 7th 2008, 08:37 AM
Moo
This is certainly not a good substitution... I mean if you're doing an exercise, you will generally be asked to find an iteration relation ;)
• April 7th 2008, 08:54 AM
Mathstud28
Yeah
that is why I am seeking a good alternative to Bruno's formula