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September 4, 2015

Homework Help: Calculus

Posted by W on Monday, November 21, 2011 at 12:12am.

How do I integrate (e^(3/x))/(x^2) from 1 to 3. I understand how and why I need to do u-substitution, with u=3/x and so dx=(-3 du)/x^2. After plugging (-3 du)/x^2 in for dx, I get a really messy problem that I don't know how to finish. Can you please explain the step?
Thanks for your help!

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