# Integration Tables

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

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

## Answers and Replies

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