Complex

• X = rCos(θ)
• y = rSin(θ)
• θ = arg(z)
• r = |z|
• Z = x + iy
• z in modulus argument form

  z = r(cos(θ) + i(sin(θ))
• |z1| * |z2| = |z1 * z2|
• arg(z1) + arg(z2) = arg(z1 * z2)