(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

[tex]\int_0 ^\pi \sqrt{1-\sin^2 x} dx[/tex]

2. Relevant equations

[tex]1 - \sin^2 x = \cos^2 x[/tex]

3. The attempt at a solution

I don't know how to treat this since cos changes sign half way across the integral. I know the answer should be 2 but I keep getting 0 every which way I try.

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# Homework Help: Trig integrating with absolute values:

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