# Math Help - Integration

1. ## Integration

Hello everyone, first post here. I just need some help on this integral. I can't seem to get it right, any help is appreciated. I don't even need a full solution, just give me some hints. Thanks.

2. Originally Posted by changing_seasons
Hello everyone, first post here. I just need some help on this integral. I can't seem to get it right, any help is appreciated. I don't even need a full solution, just give me some hints. Thanks.

$a\not = 0$
First open the parantheses.
$\int
x\sqrt{1-\frac{x^2}{a^2}}dx$

Use substitution function,
$u=\frac{x^2}{a^2}$
The rest is trivial.

3. Oh yeah, I got it now. Thanks.