Polar Form (cis) (z = r(cos θ + i sin θ), r = |z|)
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z = r(cos θ + i sin θ), r = |z|
What each symbol means
| Symbol | What it stands for |
|---|---|
| r | Modulus |z| |
| θ | Any argument of z |
When to use this
z ≠ 0 for unique r > 0; θ determined up to 2πk. z = 0 has r = 0, θ arbitrary.