MATH · CALENDAR
∣z∣=a2+b2, argz=arctan(b/a)|z|=\sqrt{a^2+b^2},\; \arg z=\arctan(b/a)∣z∣=a2+b2,argz=arctan(b/a)
复数a+bi的模、辐角和乘法几何意义.