can someone please advise me how to differentiate the following

Last edited by mr fantastic; Apr 7th 2009 at 06:25 AM. Reason: Fixed latex and clarified the question in light of later posts by the OP

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The expression can be simplified to , then just differentiate that. Are you sorted now?

Last edited by mr fantastic; Apr 7th 2009 at 06:27 AM. Reason: Merged posts and consequent editing