im working on some homework that the instructor recently gave us the solutions to and im confused on something that hes done.(adsbygoogle = window.adsbygoogle || []).push({});

intailly i have

∫N^{2}(x+a/2)^{2}(x-a/2)^{2}the integral is from a/2 to -a/2

the next step is this

∫2N^{2}(x^{2}-a^{2}/4)^{2}integrated from a/2 to 0

i dont understand why the limits of integration are changing and where the new numbers are coming from. is this something that can be done because the initial limits are opposites of each other?

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# Integration question

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