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let z1, z2,z3 be vertices of triangle AB...

let `z1, z2,z3` be vertices of `triangle ABC` in an anticlockwise order and `angle ACB = theta` then `z_2-z_3 = CB/CA(z_1-z3) e^itheta` .let p point on a circle with op diameter 2points Q & R taken on a circle such that `angle POQ & QOR= theta` if O be origin and PQR are complex no. `z1, z2, z3` respectively then ` z_3^2/(z_1.z_2)=` (A) `sec^2theta.cos2theta` (B) `costheta.sec^2(2theta)` (C) `cos^2theta.sec2theta` (D) `sectheta.sec^2(2theta)`

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