1(2⁢π)n⁢∫[-π,π]n∏1≤j<k≤n|ⅇⅈ⁢θj-ⅇⅈ⁢θk|2⁢b⁢ⅆ⁡θ1⁢⋯⁢ⅆ⁡θn=Γ⁡(1+b⁢n)(Γ⁡(1+b))n,