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If `A= (a_(ij))` is a `4xx4` matrix and `C_(ij)`, is the co-factor of the element `a_(ij)`, in `Det (A)`, then the expression `a_11C_11+a_12C_12+a_13C_13+a_14C_14` equals-

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Co factor matrix=
`|[a_(22)​a_(33)​−a_(23)​a_(32)​],[−a_(12)​a_(33)​+a_(13)​a_(32)],[​a_(12)​a_(23)​−a_(13)​a_(22)​​]|`
`|[−a_(21)​a_(33)​+a_(23)​a_(31)​],[a_(11)​a_(33)​−a_(13)​a_(31)​],[−a_(11)​a_(23)​+a_(13)​a_(21)]|`
`|[​​a_(21)​a_(32)​−a_(22)​a_(31)], ...
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