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A = E - 2BB^T, A^T = E - 2(BB^T)^T = E - 2BB^T = A.
B = (1, -1, 2)^T, BB^T =
[ 1 -1 2]
[-1 1 -2]
[ 2 -2 4]
E - 2BB^T =
[-1 2 -4]
[ 2 -1 4]
[-4 4 -7]
B = (1, -1, 2)^T, BB^T =
[ 1 -1 2]
[-1 1 -2]
[ 2 -2 4]
E - 2BB^T =
[-1 2 -4]
[ 2 -1 4]
[-4 4 -7]
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