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Using the property of inverse, 
, we can extend the given table
x f(x) f^(-1)(f(x))
-1 1 -1
2 3 2
3 6 3
5 7 5
7 8 7
x f(x) f^(-1)(f(x))
-1 1 -1
2 3 2
3 6 3
5 7 5
7 8 7