Hello,
I have a problem with derivative.Sorry,my topic is abit off :P,not use to doing this stuff at the computer.
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The book says that the right answer is
Thank you
This question involves multiple use of the chain rule. To make it manageable, split it into smaller sections. Start by putting . Then . By the chain rule,
Now you have to find . Do that in the same way, putting , where , and using the chain rule to find in terms of . Then use the chain rule once more to find . Finally, put everything together into a single expression and simplify it.
BTW this is a classic example of a case where using parentheses correctly makes things much easier to read: looks like a jumble, but is a lot clearer.