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Nov 24, 2016 at 12:39 comment added Carlo Beenakker you need to help Mathematica by telling it that $\lambda>0$, so the full command is Integrate[Cos[1/(3*u^3) + u*lambda^2/4], {u, 0, Infinity}, Assumptions -> lambda > 0] --- on Mathematica 11 that evaluates in terms of these hypergeometric functions.
Nov 24, 2016 at 12:18 comment added Châu Trị I wonder whether it's because I use Mathematica student version that it refuses to compute such integral.
Nov 24, 2016 at 8:05 comment added Carlo Beenakker there's no "code" really, I just asked Mathematica to ${\tt Integrate}[\cos[1/(3u^3)+u\lambda^2/4,\{u,0,{\tt Infinity}\}]$, and then I massaged the output to make it more compact and systematic.
Nov 24, 2016 at 4:47 comment added Châu Trị Could you show me the codes please?
Nov 23, 2016 at 14:33 history edited Carlo Beenakker CC BY-SA 3.0
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Nov 23, 2016 at 14:27 history edited Carlo Beenakker CC BY-SA 3.0
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Nov 23, 2016 at 14:20 history undeleted Carlo Beenakker
Nov 23, 2016 at 14:20 history edited Carlo Beenakker CC BY-SA 3.0
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Nov 23, 2016 at 9:48 history edited Carlo Beenakker CC BY-SA 3.0
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Nov 23, 2016 at 9:45 history deleted Carlo Beenakker via Vote
Nov 23, 2016 at 9:40 history edited Carlo Beenakker CC BY-SA 3.0
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Nov 23, 2016 at 9:36 comment added Amir Sagiv To get this result, do you need just straightforward computation, or something more involved?
Nov 23, 2016 at 9:32 history answered Carlo Beenakker CC BY-SA 3.0