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|z| = √(x² + y²) where z = x + iy.
It indicates the direction of z on the Argand diagram.
-π < θ ≤ π.
z = r(cos θ + i sin θ) = r · cis θ.
|z| = √(3² + 4²) = 5.
θ = tan⁻¹(4/3) ≈ 0.93 radians.
|z₁z₂| = |z₁||z₂|.
arg(z₁z₂) = arg(z₁) + arg(z₂).
|z₁/z₂| = |z₁|/|z₂|.
arg(z₁/z₂) = arg(z₁) - arg(z₂).
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