-ζ⁢ζ2-α2-α2⁢arccosh⁡(-ζα)=-Xμ+2⁢κμ⁢ln⁡(2⁢κ-X-x2⁢κ2-μ2)+2⁢ln⁡(μ⁢X+2⁢μ2-κ⁢xx⁢κ2-μ2),