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$9-14$ Evaluate the minor and cofactor using the matrix $A$ $$ A=\left[\begin{array}{rrr}{1} & {0} & {\frac{1}{2}} \\ {-3} & {5} & {2} \\ {0} & {0} & {4}\end{array}\right] $$ $$ M_{23}, A_{23} $$
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$9-14$ Evaluate the minor and cofactor using the matrix $A$ $$ A=\left[\begin{array}{rrr}{1} & {0} & {\frac{1}{2}} \\ {-3} & {5} & {2} \\ {0} & {0} & {4}\end{array}\right] $$ $$ M_{12}, A_{12} $$
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