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Homework Help: Trig integration

  1. Feb 4, 2016 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
    okay so i did a u substitution letting u=3x so we get 1/3∫sin(2sinh(u)) but i have no idea how to get rid of the sinh, i tried writing in exponential form or maybe i have to use some identity.. im not sure where to go from there!
  2. jcsd
  3. Feb 4, 2016 #2


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    Staff Emeritus
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    You should always include the dx or whatever when writing an integral.

    It's not clear this integral even has an anti-derivative which can be expressed in terms of elementary functions.

    Where does this integral come from?
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