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let z(1=10+6i,z(2)=4+6i,where i=sqrt((...

let `z_(1=10+6i,z_(2)=4+6i,where
i=sqrt((-1)).` If z is a complex number , such that the argument of `(z-z_(1))//(z-z_(2))ispi//4,` then prove that`|z-7-9i|=3sqrt(2).`

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