Equation Icon  jm∑ax ϕ(r,t) = ϕ (r )cos([2j − 1] ωt ) , (65 ) 2j− 1 j=1 jm∑ax j∑max A(r,t) = A2j(r)cos(2j ωt), C (r,t) = C2j(r)cos(2 j ωt) , (66 ) j=0 j=0