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If `a_(ij)` is an element in ith row and jth column of a 3rd order determinant and `c_(ij)` be the cofactor of `a_(ij)`, then what is the value of `a_(12)c_(12)-a_(21)c_(21)+a_(13)c_(13)-a_(31)c_(31)` ?

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if a_(ij) is the element in the ith row and jth column of a 3rd order determinant whose value is 1 and c_(ij) is the cofactor of a_(ij) then what is value of a_11(c_11+c_21)+a_12(c_12+c_22)+a_13(c_13+c_23) ?

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