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[4 3]
K| A^t | = A^-1
K [ 2 1 ]. = 1/ad-bc [3 -1 ]
[ 4 3 ] [-4 2 ]
=1/2.3-1.4 [3 -1 ]
[-4 2]
=1/6-4[3 -1 ]
[-4 2]
=1/2 [3 -1 ]
[-4 2]
[2k k] =. [3/2 -1/2 ]
[4k 3k] [-2. 1. ]
2k = 3/2
K =3/2 /2
=3/2 x.1/2
K=3/4