If \( X=\frac{1+a}{1-a} \) and \( Y=\frac{1-a}{1+a} \), then find \( X^{2}+Y^{2}+ \) \( X Y \). ...

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If \( X=\frac{1+a}{1-a} \) and \( Y=\frac{1-a}{1+a} \), then find \( X^{2}+Y^{2}+ \) \( X Y \).
\( \therefore: \)
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