I need to know how to get this part.
Here's the problem:
Now it's obvious that you can use the product rule to differentiate the three of these, which I've done.
It'll look something like this:
However, on the last part, I'm only able to get 2 parts of the answer. The and are kept constant while I'm having trouble differentiating the :
When seemed obvious to me was that you'd bring the power of 2 to the outside and then differentiate, which would lead to but this is not the answer in the back of the book.
is supposed to be =
I had four tutors working on this problem who gave up on it at my college, which I thought was either sad or Michael Spivak (author of this legendary Calculus text) made an error.