If z1=3+4iz_1 = 3 + 4iz1=3+4i and z2=1−iz_2 = 1 - iz2=1−i, compute the argument of z1/z2z_1/z_2z1/z2.
\arctan(7) + \pi/4
\arctan(4/3) - \pi/4
\arctan(7) - \arctan(4/3)
\arctan(4/3) + \pi/4