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Modulus–argument (polar) form $z = r\left( {\cos \theta + {\text{i}}\sin \theta } \right) = r{\text{cis}}\theta = r{e^{{\text{i}}\theta }}$

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Topic 1 - Core: Algebra » 1.6 » Modulus–argument (polar) form

z = r (cos θ + i sin θ) = r cis θ = r e^{i θ}

$z = r\left( {\cos \theta + {\text{i}}\sin \theta } \right) = r{\text{cis}}\theta = r{e^{{\text{i}}\theta }}$

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