To solve something like:

Would I use the chain rule twice?

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- Mar 13th 2010, 04:56 PMZanderistTwo Chain-Rules in one?
To solve something like:

Would I use the chain rule twice? - Mar 13th 2010, 05:04 PMRiyzar
Multiply out and then use the product rule.

You'll have to use the chain rule once.

EDIT: Looking at your code did you mean ? - Mar 13th 2010, 05:07 PMZanderist
- Mar 13th 2010, 05:11 PMRiyzar
Ah ok, then yes you will.

You should use the chain rule to find the derivatives of and of

And then use the product rule. - Mar 13th 2010, 05:18 PMZanderist
So that ends up being:

- Mar 13th 2010, 05:27 PMRiyzar
Close, look at this:

- Mar 13th 2010, 05:29 PMZanderist
oh god, I added in that 48 by mistake.

- Mar 13th 2010, 05:34 PMRiyzar
Easy mistake (Happy) you did the same thing for the derivative of So just make sure you check that and then you should be good!

- Mar 13th 2010, 06:16 PMZanderist
- Mar 13th 2010, 06:45 PMione
- Mar 13th 2010, 08:00 PMZanderist