For 1, you multiplied correctly, but should simplify by combining the two x^{3} terms. When you differentiated, you have an error in the last term.
When you used the product rule, you differentiated incorrectly when you found u'. If u = 3 - x^{2}, u' = -2x, not -2x^{-3} as you have. This is basically the same mistake that you made in the first part of this problem.
In 2, you only did this problem in one way - you didn't use the product rule. When you multiplied (x + 1/x) and (x - 1/x + 1) you have several mistakes. You ended up with two terms but there should be four.
r-soy, have you figured these out? Many times you ask a question about your work, get a reply, and then don't say anything more until you have a new question.
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