# Difference between revisions of "Manuals/calci/CIS"

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− | + | <div style="font-size:30px">'''CIS (Theta)'''</div><br/> | |

+ | *<math>Theta</math> is the angle value. | ||

+ | |||

+ | ==Description== | ||

+ | *This function gives the CIS value. | ||

+ | *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>. | ||

+ | *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 "Cis" abbreviates "Cos + i Sin". |

## Revision as of 15:09, 22 December 2016

**CIS (Theta)**

- is the angle value.

## Description

- This function gives the CIS value.
- CIS is another name for the complex exponential.
- , where is the function, is the imaginary unit and is the .
- Also; and =-1.
- So "Cis" abbreviates "Cos + i Sin".