[1]a- Prove that a square matrix A is invertible iff A"A is invertible . b- Prove that without evaluating the determinants |a1 b1 a1 +b1 +c1] a2 b2 a2 + b2 + c2 =|a2 la3 b3 az + b3 + C3 b2 C2 la3 b3 C3

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