Hello everyone,
i have a problem with an integration. I am using Wolfram "Mathematica 10.0 Student Edition" and i want to solve the Integral:
Integrate[1/(R^2 + 2 R a Cos[x-y]+a^2)^2,{x, 0 ,2 Pi}, Assumptions -> R > a > 0 && y Element[0, Pi ] ] ]
The result should be:
(2 Pi (a^2 + R^2))/(R^2-a^2)^3
but when i calculate it, Mathematica always gives me the answer 0. I have seen that this integration works on another computer and now i do not understand why i do not get the correct result.
Thank's for your help!