This is similar to our `-1 + 5j` example above, but this time we are in the 3rd quadrant.

`r=sqrt(1+25)` `=sqrt(26)~~5.10`

`θ = π + 1.37 = 4.51` radians

The graph for this example:

So

`-1-5j=5.10\ e^(4.51j)`

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