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Jun 26th, 2019
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  1. Integrate[Sin[θ]^(D1 - Nc - 1)/(A Cos[θ] - I ϵ)^(N1 - Nc), {θ, 0, π},
  2. Assumptions -> A > 0 && ϵ > 0]
  3.  
  4. Limit[%, ϵ -> 0]
  5.  
  6. Integrate[Sin[θ]^(D1 - Nc - 1)/(A Cos[θ] - B)^(N1 - Nc), {θ, 0, π}]
  7.  
  8. Limit[%, B -> 0]
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