12⁢π⁢∫-∞∞|Γ⁡(a+ⅈ⁢t)|2⁢ⅇ(2⁢b-π)⁢t⁢ⅆ⁡t=Γ⁡(2⁢a)(2⁢sin⁡b)2⁢a,