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Cis

Revision as of 18:13, 7 July 2006 by Xantos C. Guin (talk | contribs) (Since several complex numbers don't have a magnitude of 1, z=r*cis(theta))

Cis notation is a polar notation for complex numbers. For all complex numbers $z$, we can write $z=r\mathrm{cis }(\theta)=r\cos \theta + ir\sin \theta$. Notice that $\mathrm{cis}$ is made up by the first letter of $\cos$, $i$, and the first letter of $\sin$.

See also

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