5. Consider the time-harmonic vector B(t) = 3 cos(45° - wt)ax - 4 sin(wt)ay a. Find its phasor form. Transform the phasor form B back to the time domain, and verify that it equals B(t). b. If B represents a time-harmonic field that is a function of position such that B(z,t) = 3 cos(45° + ẞz - wt)αx + 4 sin(ẞz - wt)ay find the phasor form B.