1.

Find minors and cofactors of the elements a_(11),a_(21) in the determinant Delta=|{:(a_(11),a_(12),a_(13)),(a_(21),a_(22),a_(23)),(a_(31),a_(32),a_(33)):}|

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ANSWER :MINOR : `a_(11)=M_(11)=a_(22)a_(33)-a_(23)-a_(23)a_(32)`
`a_(21)=M_(21)=a_(12)a_(33)-a_(13)a_(32)`
COFACTOR : `a_(11)=a_(22)a_(33)-a_(23)a_(32)`
`a_(21)=-a_(12)a_(33)+a_(13)a_(32)`


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