## Changing Limits of Integration affects variable substitution?

1. The problem statement, all variables and given/known data

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2. Relevant equations

3. The attempt at a solution
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 Recognitions: Homework Help not exactly sure what the question is... couple of points though, it is usually easier to use a different dummy variable when you use a subtitution say you have $$\int_b^a dt f(t)$$ and want to change to u(t) = t/2, then t=2u dt = 2.du u(a) = a/2 u(b) = b/2 so the integral becomes $$\int_{b/2}^{a/2} 2.du f(2u)$$ see how this compares with your case...
 thanks