If \( \quad x=\frac{2}{\sqrt{10}-\sqrt{8}}, y=\frac{2}{\sqrt{10}+2 \sqrt{2}}, \quad \) then \[ (...

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If \( \quad x=\frac{2}{\sqrt{10}-\sqrt{8}}, y=\frac{2}{\sqrt{10}+2 \sqrt{2}}, \quad \) then
\[
(x-y)^{2}=
\]
(a) \( 4 \sqrt{2} \)
(b) 32
(c) \( 8 \sqrt{2} \)
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