L⁡(1-s,χ)=ks-1⁢Γ⁡(s)(2⁢π)s⁢(ⅇ-π⁢ⅈ⁢s/2+χ⁡(-1)⁢ⅇπ⁢ⅈ⁢s/2)⁢G⁡(χ)⁢L⁡(s,χ¯),