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Cis

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CisReIm
CisContours

Cis(x) is another name for the complex exponential,

Cis(x)=e^(ix)=cosx+isinx.
(1)

It has derivative

d/(dz)Cis(z)=ie^(iz)
(2)

and indefinite integral

intCis(z)dz=-ie^(iz).
(3)

See also

Cosine, Exponential Function, Phasor, Sine

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Cite this as:

Weisstein, Eric W. "Cis." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Cis.html

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