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Integration by part not working

  1. Oct 27, 2016 #1
    1. The problem statement, all variables and given/known data
    I have three integrals, from 0 to 1
    ∫ -4x5 ex3-x4dt
    ∫ 3x4ex3-x4dt
    ∫ 2tex3-x4dt

    2. Relevant equations
    Looks like they are not integrable, as ex3-x4 is not,
    I tried by part, let say u =
    3. The attempt at a solution
  2. jcsd
  3. Oct 27, 2016 #2


    Staff: Mentor

    If you have written the integrals exactly as they were given, they should all be very easy. The variable of integration in all three is t (based on the dt part).

    As an example, ##\int e^x dt = e^x \int 1 dt = e^x (t + C)##
  4. Oct 27, 2016 #3
    Oh, written wrong, should be dx,sorry
  5. Oct 27, 2016 #4


    Staff: Mentor

    Should the last one you listed be ##\int_0^1 2xe^{x^3 - x^4}dx##?

    Can you post a photo of the problems? I'm wondering if there's something you left out.
  6. Oct 27, 2016 #5
    Yes, thanks I solved it tho, by recombine the parts in the integral and using by part
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