however the solution the manual was rather subtraction instead of addition ? the reason the book answer was subtraction, is because they moved the to the denominator and turned it into & used the quotient rule.
so you would have:
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find the derivative
i got this not really simplified and im not sure how to
see above in red! For the second one, change the square root into and then do your chain rule. Then when you are finished taking the derivative, you can change any of those left back into roots.