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Homework Help: Integration problem

  1. Mar 7, 2013 #1
    1. The problem statement, all variables and given/known data

    Integrate [itex]\int3^x\cos x\,dx[/itex]

    3. The attempt at a solution

    It has to be done using partial integration.

    I don't know what should be u?
  2. jcsd
  3. Mar 7, 2013 #2
    What choices do you have?
  4. Mar 7, 2013 #3


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    Staff Emeritus
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    You're just going to have to try stuff out and see how it works out.
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