Argument of z1 z2:

Aarg(z1) + arg(z2) (modulo 2π)

Barg(z1)/arg(z2)

Carg(z1) - arg(z2)

Darg(z1) × arg(z2)

Answer & Solution

Correct answer: A. arg(z1) + arg(z2) (modulo 2π)

arg(z1 z2) = arg(z1) + arg(z2) (mod 2π). So multiplying complex numbers adds their arguments and multiplies their moduli. **Geometric:** rotation and scaling.

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