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Thread: A derivative question...

  1. March 2nd 2010, 01:04 PM #1
    fleabass123
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    A derivative question...

    I'm currently stuck on this problem:


    I tried using the product rule and got , which is wrong. I'm not sure what to try now. Any help would be appreciated. Thanks!
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  2. March 2nd 2010, 01:12 PM #2
    Aryth
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    Did you try simplifying it:

    Notice that both terms in the derivative share both a e^t and a sech(t) so that you can pull them out to get:

    f'(t) = e^tsech(t)(1 - tanh(t))
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  3. March 2nd 2010, 01:22 PM #3
    fleabass123
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    Yeah that was right. Just wasn't simplified enough. Thanks so much!
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  4. March 2nd 2010, 01:22 PM #4
    General
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    Quote Originally Posted by fleabass123 View Post
    I'm currently stuck on this problem:


    I tried using the product rule and got , which is wrong. I'm not sure what to try now. Any help would be appreciated. Thanks!

    What makes you think its wrong?
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