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![\frac{ \sqrt{7 - 1} }{ \sqrt{7 + 1} } = \frac{ \sqrt{7 + 1} }{ \sqrt{7 - 1} } \frac{ \sqrt{7 - 1} }{ \sqrt{7 + 1} } = \frac{ \sqrt{7 + 1} }{ \sqrt{7 - 1} }](https://tex.z-dn.net/?f=+%5Cfrac%7B+%5Csqrt%7B7+-+1%7D+%7D%7B+%5Csqrt%7B7+%2B+1%7D+%7D++%3D++%5Cfrac%7B+%5Csqrt%7B7+%2B+1%7D+%7D%7B+%5Csqrt%7B7+-+1%7D+%7D+)
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