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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!

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# Homework Help: Why do these terms vanish in this solution?

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