(j1j2j1+j2m1m2-m1-m2)=(-1)j1-j2+m1+m2⁢((2⁢j1)!⁢(2⁢j2)!⁢(j1+j2+m1+m2)!⁢(j1+j2-m1-m2)!(2⁢j1+2⁢j2+1)!⁢(j1+m1)!⁢(j1-m1)!⁢(j2+m2)!⁢(j2-m2)!)12,