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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 2 points 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_2/z_1 =` (A) `e^(itheta) cos theta` (B) `e^(itheta) cos 2theta` (C) `e^(-itheta) cos theta` (D) `e^(2itheta) cos 2theta`

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