Using only elementary row or elementary column operations and Theorems 3.2, and 3.6 (do not expand the

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Using only elementary row or elementary column operations and Theorems 3.2, and 3.6 (do not expand the determinants), verify the following:
(a)
Using only elementary row or elementary column operations and Theorems

(b)

Using only elementary row or elementary column operations and Theorems
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