Find all values of the real number \(a\) so that the four complex roots of \(z^4 - 6z^3 + 11az^2 - 3(2a^2 + 3a - 3) z + 1 = 0\) form the vertices of a parallelogram in the complex plane. Enter all the values, separated by commas.

LeoIsTheBest Jun 6, 2019

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