I'm having trouble with 1F-7.b) if anyone would be kind enough to help, it would be greatly appreciated. It seems to me like obvious choice is the quotient rule and chain rule to solve this, or possibly the product rule with the chain rule. If these are indeed the ways to approach the problem, I may need a step by step :(
Link to problem set: http://ocw.mit.edu/courses/mathematics/18-01-single-variable-calculus-fall-2006/readings/e_exrcs_scsn_1_7.pdf
Link to solution: http://ocw.mit.edu/courses/mathematics/18-01-single-variable-calculus-fall-2006/readings/s_solutns_exrcis.pdf

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I got it with the substitution after a couple of attempts, thank you.

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