I have no idea how to start to solve it.

Thank you...

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- June 20th 2010, 10:52 AMAlso sprach ZarathustraIntegral problem from Hardy book #2
I have no idea how to start to solve it.

Thank you... - June 20th 2010, 11:06 AMroninpro
The first thing that comes to mind is using force. Did you try it?

- June 20th 2010, 12:13 PMchisigma
Probably it is a particular application of gaussian quadrature...

Gaussian Quadrature -- from Wolfram MathWorld

The gaussian quadrature approximate a definite integral as...

(1)

... where the are the zeroes of the Legendre polynomial of degree n. An interesting property of the gaussian quadrature is that the error*vanishes*if f(*) is a polynomial of degree less or equal to 2n-1, and that situation is achieved if n=3 and f(*) is a polynomial of degree 5 or less...

Kind regards