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## Homework Statement

http://gyazo.com/22f5c655071e49adf3f4652e8042873b

I derived the proof myself, but by arbitrary changing the t limit to infinity. I'm hoping that by understanding the diagram in the link above I will have a better idea of why I changed the limit. I currently look at it as we are finding the area of region R, but what does that have to do with signals f and g?

Thanks

Thomas