a. Euler's Identity
![](https://nokturno.fi/hallinta/wp-content/uploads/2017/06/a..jpg)
a1. Euler's Identity (vers. 1)
![](https://nokturno.fi/hallinta/wp-content/uploads/2020/05/a1.png)
a2. Euler's Identity (vers. 2)
![](https://nokturno.fi/hallinta/wp-content/uploads/2020/05/a2.png)
b. Euler's Formula
![](https://nokturno.fi/hallinta/wp-content/uploads/2020/05/b.jpg)
b1. Euler's Formula (vers. 1)
![](https://nokturno.fi/hallinta/wp-content/uploads/2020/05/b1.png)
b2. Euler's Formula (vers. 2)
![](https://nokturno.fi/hallinta/wp-content/uploads/2020/05/b2.png)
c. Euler's sum of reciprocal squares
![](https://nokturno.fi/hallinta/wp-content/uploads/2020/05/unnamed-file.c.jpg)
c1. Euler's sum of reciprocal squares (vers. 1)
![](https://nokturno.fi/hallinta/wp-content/uploads/2020/05/c1.png)
c2. Euler's sum of reciprocal squares (vers. 2)
![](https://nokturno.fi/hallinta/wp-content/uploads/2020/05/c2.png)