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Letz_(1),z_(2),z_(3) be complex numbers, not all real, such that |z_(1)|= |z_(2)| =|z_(3)| = 1 and 2(z_(1) +z_(2)+z_(3)) -3z_(1)z_(2)z_(3) in Rprove that ma (arg z_(1)arg z_(2), argz_(3)) ge pi/6 |
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