Program: 3D GrapherCoordinates: SphericalFunction:a(u,v,t)= sin(v)-1*cos(v)b(u,v,t)= cos(u)+sin(v)R(u,v,t)= sin(v)Domain of variables:Min U: -13;Max U: 12; Steps: 70;Min V: -8; Max V: 17; Steps: 60;