I have to work this problem 3 ways, and I've gotten two, but am not sure about the third way.(adsbygoogle = window.adsbygoogle || []).push({});

integral (x/sqrt(x^2-9))dx

the first way I worked by setting u = x^2 - 9

the second way I worked by setting x = 3sec(theta)

but the third way I have no clue, the book gave us a hint: Let x^2 - 9 = (sin(theta))^2

Thanks

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# Homework Help: Working problem 3 ways

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