Question

How do I evaluate `intsin (pi x) cos (pi x) dx`?

Answer 1

I would use integration by parts where you have:

`intf(x)*g(x)dx=F(x)*g(x)-intF(x)*g'(x)dx`

Where:

`F(x)=intf(x)dx`
`g'(x)` is the derivative of `g(x)`

Giving:

Hope it helps