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-+++
-title = "MathJax Support"
-date = 2021-01-03
-[taxonomies]
-categories = ["math"]
-tags = ["Euler's identity"]
-[extra]
-math = true
-+++
-
-**Please add the following lines in the front matter when using MathJax.**
-
-```
-[extra]
-math = true
-```
-
----
-
-#### Euler's identity
-
-$e^{i\pi }+1=0$
-
-#### Geometric interpretation
-
-Any complex number $z=x+iy$ can be represented by the point $(x,y)$ on the complex plane. This point can also be represented in polar coordinates as $(r,\theta )$, where $r$ is the absolute value of $z$ (distance from the origin), and $\theta$  is the argument of $z$ (angle counterclockwise from the positive x-axis). By the definitions of sine and cosine, this point has cartesian coordinates of $(r\cos \theta ,r\sin \theta )$, implying that $z=r(\cos \theta +i\sin \theta )$. According to Euler's formula, this is equivalent to saying $z=re^{i\theta}$.
-
-Euler's identity says that $-1=e^{i\pi }$. Since $e^{i\pi }$ is $re^{i\theta }$ for $r$ = 1 and $\theta =\pi$ , this can be interpreted as a fact about the number −1 on the complex plane: its distance from the origin is 1, and its angle from the positive x-axis is $\pi$ radians.
-
-[Euler's identity \- Wikipedia](https://en.wikipedia.org/wiki/Euler%27s_identity)
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