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જો ${a^2} + {b^2} + {c^2} + ab + bc + ca \leq 0\,\forall a,\,b,\,c\, \in \,R$ , હોય તો $\left| {\begin{array}{*{20}{c}} {{{(a + b + c)}^2}}&{{a^2} + {b^2}}&1 \\ 1&{{{(b + c + 2)}^2}}&{{b^2} + {c^2}} \\ {{c^2} + {a^2}}&1&{{{(c + a + 2)}^2}} \end{array}} \right|$ ની કિમત મેળવો.