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Single Answer type: Let \( g ( x ) = 1 + x - [ x ] \) and \( f ( x ) \) \( ( A ) x \) 2 \( = \left\{ \begin{array} { l } { - 1 , \text { if } x < 0 } \\ { 0 , \text { if } x = 0 , \text { then } \frac { f ( g ( 2009 ) ) } { g ( f ( 2009 ) ) } = } \\ { 1 , \text { if } x > 0 } \\ { \text { (C) } f ( x ) } \end{array} \right. \) (D) \( g ( x ) \)
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