If theta is real and z(1), z(2) are conn...

If `theta` is real and `z_(1), z_(2)` are connected by `z_(1)^(2) + z_(2)^(2) + 2z_(1)z_(2) cos theta= 0`, then prove that the triangle formed by vertices O `z_(1) and z_(2)` is isosceles.

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