Saturday, 31 October 2015

integration - How can I evaluate inti0nftyfracsinxx,dx? [may be duplicated]




How can I evaluate 0sinxxdx? (Let sin00=1.)




I proved that this integral exists by Cauchy's sequence.



However I can't evaluate what is the exact value of this integral.


Answer



It's a famous Dirichlet integral.
http://en.wikipedia.org/wiki/Dirichlet_integral


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