1. Nov 4, 2006 #1

   Xkaliber

   

   Does anyone know of any online integration tables that are fairly robust?
   
   I need to know how to integrate [tex]\int x sin(ax) sin(bx) dx[/tex]

    

   Xkaliber, Nov 4, 2006
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3. Nov 4, 2006 #2

   Office_Shredder

   

   Staff Emeritus

   Science Advisor

   Gold Member

   integrals.wolfram.com/index.jsp doesn't work?
   
   EDIT: Lol.... I forgot how it bungles trig... it probably gives a right answer, but it's not the one you want

    

   Office_Shredder, Nov 4, 2006
4. Nov 4, 2006 #3

   Xkaliber

   

   The calculator gave me [tex]\frac{1}{2}(\frac{cos((a-b)x)}{(a-b)^2}-\frac{cos((a+b)x)}{(a+b)^2}+\frac{xsin((a-b)x)}{(a-b)}-\frac{xsin((a+b)x)}{(a+b)})[/tex]
   
   Is this correct?

    

   Xkaliber, Nov 4, 2006

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