1 | initial version |

Your code contains syntax errors. One of the problems seems to be:

```
sin^2(j*2*pi/N)
```

Did you mean `(sin(j*2*pi/N))^2`

?

2 | No.2 Revision |

Your code contains syntax errors. One of the problems seems to be:

```
sin^2(j*2*pi/N)
```

Did you mean

?~~(sin(j*2*pi/N))^2~~sin(j*2*pi/N)^2

Seems like this is the only error.

3 | No.3 Revision |

Your code contains syntax errors. One of the problems seems to be:

```
sin^2(j*2*pi/N)
```

This is being interpreted as `sin^(2(j*2*pi/N))`

, which is problably not what you meant. Did you mean `sin(j*2*pi/N)^2`

?

Seems like this is the only error.

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