# Difference between revisions of "De Moivre's Theorem"

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(New page: De Moivre’s Theorem is a fundamental statement of complex analysis, where ''i'' represents the square root of (-1): :<math>\left(\cos x+i\sin x\right)^n=\cos\left(nx\right)+i\sin\le...) |
(Don't need to define "i"--it's fundamental. It's primordial. The fact that it's one of the square roots of -1 (and -i is the other) is a theorem.) |
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− | De Moivre’s Theorem is a fundamental statement of [[complex analysis]] | + | '''De Moivre’s Theorem''' is a fundamental statement of [[complex analysis]]: |

:<math>\left(\cos x+i\sin x\right)^n=\cos\left(nx\right)+i\sin\left(nx\right)\,</math> | :<math>\left(\cos x+i\sin x\right)^n=\cos\left(nx\right)+i\sin\left(nx\right)\,</math> | ||

Line 12: | Line 12: | ||

:<math>\left( e^{ix} \right)^n = e^{inx} \,</math> | :<math>\left( e^{ix} \right)^n = e^{inx} \,</math> | ||

− | Therefore from [[Euler's formula]]: | + | Therefore, from [[Euler's formula]]: |

:<math>e^{i(nx)} = \cos(nx) + i\sin(nx)\,</math> | :<math>e^{i(nx)} = \cos(nx) + i\sin(nx)\,</math> | ||

− | + | [[Category:Mathematics]] | |

− | [[ | + |

## Latest revision as of 18:56, 14 July 2018

**De Moivre’s Theorem** is a fundamental statement of complex analysis:

## Extension of Euler's formula

De Moivre's formula is a trivial extension of Euler's formula:

Because

Therefore, from Euler's formula: