beiν′⁡x=12⁢Mν+1⁢sin⁡(θν+1-14⁢π)-12⁢Mν-1⁢sin⁡(θν-1-14⁢π)=(ν/x)⁢Mν⁢sin⁡θν+Mν+1⁢sin⁡(θν+1-14⁢π)=-(ν/x)⁢Mν⁢sin⁡θν-Mν-1⁢sin⁡(θν-1-14⁢π).