I'm baffled by P-set 1G-5(b). I've checked the answer and can't make sense of it.
1. I don't see how all terms but the one provided contain a 0-factor.
2. I don't understand the reasoning behind the following:
"If u =x^p, then u^p = p!"
Does the p here refer only to the pth derivative of u, or also to the pth power of x?
FWIW, I calculated the third derivative of 1G-5(a), and found the following. (The 3rd derivative is not given in the solution sheet.):
y''' = u'''v + 3u''v' + 3u'v'' +uv'''
Thank you!

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