11 . Let f ( x) � 3� x , for x � 3.
( a ) Find f � 1 ( 10 ) .
( b ) Let g be a function such that g( 5 ) numbers .
� � and
1 g � exists for all real
[ 3 ]
( i ) Write down
� g 1 ( � ).
( ii ) Hence , find
1 1
( f � � g )( � )
. [ 3 ]
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