|a11 a12 a13|=a11a22a33-a11a23a32+a12a23a31-a12a21a33+a13a32a21-a13a22a31 a21 a22 a23 a31 a32 a33 =a11a22a33+a12a23a31+a13a21a32-a11a23a32-a12a21a33-a13a22a31
