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If f(x) = ( x - 1 ) /( x + 1 ) , then f(...

If `f(x) = ( x - 1 ) /( x + 1 )` , then `f(-1/x )` is equal to

( A ) `-1/f(x)`
( B )` 1/f(x)`
( C ) f(x)
( D ) -f(x)

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