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quadratic linear form XFX with matrix

```
F: 1 1
1 1
```

in canonical base can be expressed as X' F' X'

```
X' 1 0 X'
0 0
```

where X'=A-1X, F'=AFA and A is transition matrix. Canonical base vectors are [1,0] and [-1,1]. Thus this is correct that (a+b)^2 = a^2 + b^2 + 2ab

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