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para uma matriz simétrica 2 * 2 que tr(A^TA) = sum _(i,j) a_(ij)^2 (norma de Frobenius ao quadrado)
para uma matriz simétrica 2 * 2 que tr(A^TA) = sum _(i,j) a_(ij)^2 (norma de Frobenius ao quadrado)
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