- #1

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## Homework Statement

http://i50.tinypic.com/zxw6qr.png

a>0

a

∫ x√(x^2+a^2)dx (a>0)

0

**2. The attempt at a solution**

u=x^2+a^2

du=2xdx

I looked it up online and I saw you needed to use trig.

How do you use trig for this problem?

Note: I have not learned integration by parts, just u-sub.