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Let z1 = 10 + 6i and z2 = 4 + 6i. If z i...

Let `z_1 = 10 + 6i` and `z_2 = 4 + 6i`. If z is a complex number such that the argument of `(z-z_1)/(z-z_2) is pi/4`, then prove that ` |z - 7-9i| = 3 sqrt2`.

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