# When getting phase angle difference, do amplitudes have to be positive

by Vishera
Tags: amplitudes, angle, difference, phase, positive
 P: 45 $$f(x)=32sin(x+60°)\quad and\quad g(x)=-1.5sin(x+45°)$$ Would the phase angle difference here be 15° or is that incorrect? I think the amplitudes don't have to be the same but I'm not sure if they at least have to be both positive.
 P: 45 When getting phase angle difference, do amplitudes have to be positive $$-1.5sin(x+45°)\\ =1.5sin(x+225°)$$ Here the phase angle difference is 165°. So which would be more correct? The phase angle difference is simply defined as the difference between the two phase angles in two sinusoids, right? So are they both right?