- #1
mmwave
- 647
- 2
As a minor step in a quantum mechanics problem I need to integrate x * sin(pi*x/a) * sin (2pi*x/a) over the interval 0 to a.
I have had no luck and can't find it in my tables. Do I have to convert it to exponentials and integrate all those terms?
I tried using sin 2y = 2siny cosy to get
[inte] y * 2sin2(y) cos(y) dy
but that didn't get me anywhere. Help would be greatly appreciated.
I have had no luck and can't find it in my tables. Do I have to convert it to exponentials and integrate all those terms?
I tried using sin 2y = 2siny cosy to get
[inte] y * 2sin2(y) cos(y) dy
but that didn't get me anywhere. Help would be greatly appreciated.
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