HP 50G help

[Marcio]

I think that sine inside the integral is going to get you into trouble if you try to solve the problem all at once.

If you solve it by parts, you will get a function f with only "a" as unknown. Give it a good guess and you'll get the answer.

Edit: These are some of the zeros, assuming "a" is positive:

1.344702
1.761940
2.206740

Note some of them are really close to each other.