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Let z1,z2 and origin represent vertices ...

Let `z_1,z_2` and origin represent vertices A,B,O respectively of an isosceles triangel OAB, where OA=OB and `/_AOB=2theta. ` If `z_1,z_2` are the roots of the equation `z^2+2az+b=0` where a,b re comlex numbers then `cos^2theta=` (A) `a/b` (B) `a^2/b^2` (C) `a/b^2` (D) `a^2/b`

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