berν′⁡x=12⁢Mν+1⁢cos⁡(θν+1-14⁢π)-12⁢Mν-1⁢cos⁡(θν-1-14⁢π)=(ν/x)⁢Mν⁢cos⁡θν+Mν+1⁢cos⁡(θν+1-14⁢π)=-(ν/x)⁢Mν⁢cos⁡θν-Mν-1⁢cos⁡(θν-1-14⁢π),