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Set \( u + rac{1}{u} = 2 \). Multiply by \(u\): \( u^2 - 2u + 1 = 0 \Rightarrow (u - 1)^2 = 0 \Rightarrow u = 1 \), still.
So \( rac{z + w}{z - w} = 1 \Rightarrow z + w = z - w \Rightarrow
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