E(μ)
=
1+12(ln4k′−11⋅2)(k′)2+12⋅322⋅4(ln4k′−21⋅2−13⋅4)(k′)4+12⋅32⋅522⋅42⋅6(ln4k′−21⋅2−23⋅4−15⋅6)(k′)6+⋯
Gradshteyn & Ryzhik (1965), §8.114.3
where: k'≡(1−μ2)1/2