|αα+dα+2d|
|α+dα+2dα|
|α+2dαα+d|
| α α+d α+2d| | α+d α+2d α | |α+2d α α+d| = |3α+3d α+d α+2d| |3α+3d α+2d α | |3α+3d α α+d | =3(α+d) |1 α+d α+2d| |1 α+2d α | |1 α α+d| =3(α+d) |0 d d | |0 2d -d | |1 α α+d| =3(α+d) |d d| |2d -d| =3α2(α+d) |1 1| |2 -1| =-9d2(α+d)
