I was looking over my lectures notes and became stumped when the lecturer began manipulating an integral using a dummy variable. I've attached the integral below as a JPEG. I can follow the substitution up until the very end but am having trouble understanding why he replaced u with a positive s and not a negative s at the end.(adsbygoogle = window.adsbygoogle || []).push({});

Any help would be appreciated.

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# I Manipulation of Integral limits

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