Integration Tables

1. Nov 4, 2006

Xkaliber

Does anyone know of any online integration tables that are fairly robust?

I need to know how to integrate $$\int x sin(ax) sin(bx) dx$$

2. Nov 4, 2006

Office_Shredder

Staff Emeritus
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

3. Nov 4, 2006

Xkaliber

The calculator gave me $$\frac{1}{2}(\frac{cos((a-b)x)}{(a-b)^2}-\frac{cos((a+b)x)}{(a+b)^2}+\frac{xsin((a-b)x)}{(a-b)}-\frac{xsin((a+b)x)}{(a+b)})$$

Is this correct?