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The sum of products of elements of any r...

The sum of products of elements of any row with the cofactors of corresponging elements is equal to……………

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The sum of products of elements of any row with the cofactors of corresponding elements is equal to value of the determinant.
Let `Delta=|(a_(11),a_(12),a_(13)),(a_(21),a_(22),a_(23)),(a_(31),a_(32),a_(33))|`

Expanding along `R_(1)`,
`Delta=a_(11)A_(11)+a_(12)A_(12)+a_(13)A_(13)`
`=` Sum of products of elements of `R_(1)` with their corresponding cofactors.
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