8. Prove that ì [51-5, (in 5). Remark. This question does not use implicit differentiation Hint. You will need to use the fact that elnA-A for any positive real number A, a fact that was also mentioned in the hint of question 7. This will allow you to write the number 5 as eln5, and so you will be able to express 5 as (5). You will then apply the usual fact for the power of a power, namely that (ABto express 5 as a power of e. Lastly, you will apply the chain rule to find the derivative, and once you recognize that the expression 5-shows up in your answer, you will have proved the result.
