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Prove Thomsen's Relation: for any lines

`a,b`

, and

`c`

, we have

```
R_(c)R_(a)R_(b)R_(c)R_(a)R_(b)R_(a)R_(b)R_(c)R_(a)R_(b)R_(c)
\times R_(b)R_(a)R_(c)R_(b)R_(a)R_(b)R_(a)R_(c)R_(b)R_(a)=I,
```

where

`I`

is the identity transformation.