Please focus on 19-b) at the bottom. I'm not sure how hard this is supposed to be, or where comes in. I think I must be missing something. Thanks!
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Originally Posted by davismj Please focus on 19-b) at the bottom. I'm not sure how hard this is supposed to be, or where comes in. I think I must be missing something. Thanks! You need the fact that to ensure that your move of the derivative from outside the sum to inside was kosher.
Last edited by Jhevon; Feb 21st 2010 at 11:33 PM. Reason: fixed LaTeX
Originally Posted by Drexel28 You need the fact that to ensure that your move of the derivative from outside the sum to inside was kosher. Can you explain (or give an example or something) of why it wouldn't work if ? Actually, nevermind. I'm being lazy, I know this one. As always, Thanks! Also, are you really an undergraduate freshman?
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