If understood correctly, what you are trying to get is:
A1B1 = 2+3i;
A2B2 = 5+6i;
A3B3 = 1.5 - 3i;
Phase_AsBs = @(a,b,c) (a+b+c);
% Simulate
Phase_AsBs(A1B1, A2B2, A3B3)
% Or furhtermore phase ansgles and abs values
Phase_AsBs_Angle_rad = @(a,b,c) [abs(a+b+c), angle(a+b+c)]; % in Radians
disp('Magnitude and Phase angle in Radians')
Phase_AsBs_Angle_rad(A1B1, A2B2, A3B3)
Phase_AsBs_Angle_deg = @(a,b,c) [abs(a+b+c), atan2d(imag(a+b+c), real(a+b+c))]; % in Degrees
disp('Magnitude and Phase angle in Degrees')
Phase_AsBs_Angle_deg(A1B1, A2B2, A3B3)
