To solve something like:

Would I use the chain rule twice?

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- March 13th 2010, 03:56 PMZanderistTwo Chain-Rules in one?
To solve something like:

Would I use the chain rule twice? - March 13th 2010, 04:04 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 ? - March 13th 2010, 04:07 PMZanderist
- March 13th 2010, 04:11 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. - March 13th 2010, 04:18 PMZanderist
So that ends up being:

- March 13th 2010, 04:27 PMRiyzar
Close, look at this:

- March 13th 2010, 04:29 PMZanderist
oh god, I added in that 48 by mistake.

- March 13th 2010, 04:34 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!

- March 13th 2010, 05:16 PMZanderist
- March 13th 2010, 05:45 PMione
- March 13th 2010, 07:00 PMZanderist