If \( \left(\frac{1+i}{1-i}\right)^{3}-\left(\frac{1-i}{1+i}\right)...

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If \( \left(\frac{1+i}{1-i}\right)^{3}-\left(\frac{1-i}{1+i}\right)^{3}=x+i y \), then find \( (x, y) \)
\( \mathrm{P} \)
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