1. Oct 31, 2011 #1

   Ry122

   

   Could someone please explain to me why this is split into two separate terms?
   
   http://img689.imageshack.us/img689/3092/unledwyx.png [Broken]

    

   Last edited by a moderator: May 5, 2017

   Ry122, Oct 31, 2011
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3. Oct 31, 2011 #2

   Mark44

   

   Insights Author

   Staff: Mentor

   Because it's quite a bit simpler to integrate t sin(at) than to integrate (6 - 3t)sin(at). In both cases you need to use integration by parts, but the simpler integrand makes the process easier.

    

   Last edited by a moderator: May 5, 2017

   Mark44, Oct 31, 2011

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