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If in argand plane the vertices A,B,C of...

If in argand plane the vertices A,B,C of an isoceles triangle are represented by the complex nos `z_1 ,z_2, z_3` respectively where `angleC=90^@` then show that `(z_1-z_2)^2=2(z_1-z_3)(z_3-z_2)`

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