Can you also check this out for me;

where

1...

2...where and

3.... and <<<< can you explain how step 2 for "u" this turns into -x

4.... therefore;

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- November 7th 2010, 05:38 AMmadmax29Another chain rule question.
Can you also check this out for me;

where

1...

2...where and

3.... and <<<< can you explain how step 2 for "u" this turns into -x

4.... therefore; - November 7th 2010, 05:53 AMe^(i*pi)

You are using a instead of u. Minor difference but instead you need to find

1.

2. Aside from my above note about a then yes.

3. You need to use the chain rule. It's a tricky one to spot but if you imagine so the derivative is multiplied by -1. Thus

For is true because you can write it as . x^2 is simple enough but you must multiply by -1/2 which gives -x

4. Almost, because of the sign error in finding your answer is a factor of -1 out.