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 January 5th, 2010, 11:45 AM #1 Newbie   Joined: Jan 2010 Posts: 1 Thanks: 0 using beta or gamma function I have a problem solving this: $\int_{-1}^{1} \sqrt {\frac {1+x}{1-x}} dx$ The result is $\pi$. Could someone please help me
 January 10th, 2010, 04:30 PM #2 Global Moderator   Joined: Dec 2006 Posts: 19,057 Thanks: 1618 You can rewrite the integrand as (x + 1)/?(1 - x²), which splits into two terms that you can integrate.

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