Gi⁡(z)=12⁢ⅇπ⁢ⅈ/3⁢Hi⁡(z⁢ⅇ-2⁢π⁢ⅈ/3)+12⁢ⅇ-π⁢ⅈ/3⁢Hi⁡(z⁢ⅇ2⁢π⁢ⅈ/3),