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If z1, z2 are the non zero complex root...

If `z_1, z_2` are the non zero complex root of `z^2 -ax + b=0` such that `|z_1| =|z_2|`, where a, b arecomplex numbers. If `A(z_1), B(z_2) and /_AOB =theta, 'O'` being the origin, then prove `a^2=4b cos^2 (theta/2)`

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