If z1, z2 are complex numbers of amplitudes theta1, theta2. Then the amplitude of 3*Z1/Z2

Answer 1

The polar form of a complex number is r(cosθ + isinθ). The value of r is the magnitude and θ is the argument, not amplitude.

If z₁ = r₁(cosθ₁ + isinθ₁) and z₂ = r₂(cosθ₂ + isinθ₂), then

3z₁/z₂ has magnitude 3r₁/r₂ and has argument θ₁ - θ₂.