j1j2j1+j2m1m2-m1-m2=-1j1-j2+m1+m22j1!2j2!j1+j2+m1+m2!j1+j2-m1-m2!2j1+2j2+1!j1+m1!j1-m1!j2+m2!j2-m2!12,