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Integration Help!

Sorry, maybe I'm just having a complete mind blank, but currently revising for the Cambridge economics entrance test and have got stuck on one of the maths sample questions. Any help appreciated.

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Original post by poseidons
Sorry, maybe I'm just having a complete mind blank, but currently revising for the Cambridge economics entrance test and have got stuck on one of the maths sample questions. Any help appreciated.

Screen Shot 2018-10-20 at 12.09.36.png


Treat aa as a constant and evaluate that integral in terms of a.

Now can you determine what value of a minimises that expression??

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