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What is u equal to?

  1. Jun 2, 2013 #1
    1. The problem statement, all variables and given/known data
    ∫(x^7/(1+x^16)dx

    2. Relevant equations



    3. The attempt at a solution
    I feel like it's so simple. I have tried making u equal to 1+x^16 and then trying to find some sort of chain I can use to make the equation work but no luck. When i saw that arctan was in the correct answer I was lost. Any help appreciated.
     
  2. jcsd
  3. Jun 3, 2013 #2
    Never mind. I just had to look at it for a second more.
     
  4. Jun 3, 2013 #3

    HallsofIvy

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    Staff Emeritus
    Science Advisor

    And you let [itex]u= x^8[/itex]?
     
  5. Jun 3, 2013 #4
    Yes.
     
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