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If z1, z2, z3, z4 are roots of the equa...

If `z_1, z_2, z_3, z_4` are roots of the equation `a_0 z^4+a_1 z^3+a_2 z^2+a_3 z+a_4=0` ,where `a_0, a_1, a_2, a_3 and a_4` are real, then

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