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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_(23))|`

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by the definition of minor and cofactors
we have
Minor of `a_11 = M_11 = [[a_22,a_23],[a_32,a_33]]`
= `a_22. a_33 - a_23. a_32`
Cofactor of `a_11 = A_11 = (-1)^(1+1) M_11 = a_22. a_33 - a_23. a_32`
Minor of `a_21 = M_21 = [[a_12,a_13],[a_32,a_33]] = a_12.a_33 - a_31.a_32`
...
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