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| 1. |
\left. \begin{array} { l } { \text { If } f ( x ) = \frac { x - 1 } { x + 1 } , \text { then } f ( a x ) \text { in terms of } f ( x ) \text { is equal to } } \\ { \text { (a) } \frac { f ( x ) + a } { 1 + a f ( x ) } } \end{array} \right. |
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