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If the matrix A= [(3, 2, 1),( 6x^(2), 2x...

If the matrix `A= [(3, 2, 1),( 6x^(2), 2x^(3), x^(4)),( 1, a, a^(2))] ` then `(d^(2))/(dx^(2))(|A(adjA)|^((1)/(3))) at x=a` is

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