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\left. \begin array l \text If f ( x ) = \frac d x x %2B 1 , x \neq - 1 . \text Then, for what valu \\ \text is f ( f ( x ) = x \\ \text (a) \sqrt 2 \text (b) - \sqrt 2 \text (c) 1 \end array \right. |
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Answer» a= -1 |
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