For each of the following quadratic forms, obtain the coefficient matrix when the form is written in such a way that the coefficient matrix is symmetric:
a) 5x12 + 4x1x2 + 3x22
c) x12 + 3x22 – x32 + 4x1x2 + 6x1x3 + 2x2x3,
d) 2x12 + x22 + x32 + 2x1x3 – 4x2x3.
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