Then where a11 where C11 = a12 = C12 = a21 = C21 = a22 C22= A 1 = (§ 8), B= ( − 4 ³ ) ,0 = (1 ²). .C= -2 A+BT = , and A-B+CT = a12 a11 a21 a22 C21 C12 C22

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