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**Tricky Integral??**

## Homework Statement

So the problem is to integrate this:

{(x^2) / sqrt[(x^2) - 9] } dx

I cannot, for the life of me, solve this problem, and I know it's not that hard. I have tried using trig substitutions x = 3 cos(theta) and x = 3 sec(theta) but for some reason, maybe a math error, it doesn't work out. Can someone compute this for me and give steps?