3 . Let f( x) e x
3 �1
� .
( a ) Write down f� ( x)
, f�� ( x) and
( b ) Find an expression for
( n f ) ( x ).
( c ) Hence , write down the value of
( 3 f ) ( x ).
f
( 6 ) � 1
[ 3 ]
[ 3 ]
� ��
� � 3 � . [ 1 ]
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