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*CIS is another name for the complex exponential.
*CIS is another name for the complex exponential.
*<math>Cis(x)=e^{ix}=Cosx+i Sinx</math>, where <math>Cos</math> is the <math>Cosine</math> function,<math>i</math> is the imaginary unit and <math>Sin</math> is the <math>Sine</math>.
*<math>Cis(x)=e^{ix}=Cosx+i Sinx</math>, where <math>Cos</math> is the <math>Cosine</math> function,<math>i</math> is the imaginary unit and <math>Sin</math> is the <math>Sine</math>.
*Also <math> Cos(x)= \frac{e^{ix}+e^{-ix}}{2}</math>;<math>Sin(x)=\frac{e^{ix}-e^{-ix}}{2i}</math> and <math>i^2</math>=-1.
*Also <math> Cos(x)= \frac{e^{ix}+e^{-ix}}{2}</math>;
* <math>Sin(x)=\frac{e^{ix}-e^{-ix}}{2i}</math> and <math>i^2</math>=-1.
*So <math>Cis</math> abbreviates <math>Cos + i Sin</math>.
*So <math>Cis</math> abbreviates <math>Cos + i Sin</math>.