If A(z1), B(z2). C(z3) are the vertices...

If `A(z_1), B(z_2). C(z_3)` are the vertices of an equilateral triangle ABC, then `arg((z_2+z_2-2z_1)/(z_3-z_2))=pi/4` Reason(R): If `/_B=alpha, then

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