-3 4 2 ^ - (²3)-² - (2²3) --- (73) c = A = B = C (² 8 5 -2 5 4 2 Then A + B² = ₂1 ( where a11 = 921 = A-B+CT: all , 922 = " = - (o a12 = C11 a12 922 C21 , and C12 C22 "

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