See soorce fer Euler's formula

'''Euler's formula''', named efter [[Leonhard Euler]], is a [[mathematics|mathematical]] [[formula]] in [[complex analysis]] that establishes the fundamental relationship atween the [[trigonometric functions]] an the [[complex nummer|complex]] [[exponential function]]. Euler's formula states that for ony [[real nummer]]&nbsp;{{mvar|x}}:

:<math>e^{ix} = \cos x + i\sin x,</math>

[[Category:Theorems in complex analysis]]
[[Category:Airticles conteenin pruifs]]
[[Category:E (mathematical constant)]]
[[Category:Leonhard Euler]]