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Evaluate: /\ |[1+a1, a2, a3],[a1, 1+a2,...

Evaluate: ` /_\ |[1+a_1, a_2, a_3],[a_1, 1+a_2, a_3],[a_1, a_2, 1+a_3]| `

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To evaluate the determinant \[ \Delta = \begin{vmatrix} 1 + a_1 & a_2 & a_3 \\ a_1 & 1 + a_2 & a_3 \\ a_1 & a_2 & 1 + a_3 \end{vmatrix} ...
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