- #1

rokyen

- 2

- 0

## Homework Statement

I was given this problem as homework and managed to find the solution online, but I don't fully understand it.

My only question, and the reason I was getting this problem wrong, is because I wasn't realizing that the functions evaluated from -∞ to +∞ were vanishing. Is this a concept from calculus I'm not understanding or is this related somehow to a QM postulate or something?

Thanks!