f ( 2 ) = - 2 1 . Let f ( x ) and ((x ) be differentiable functions such that f ( 2) = 4, F' (2 ) =- 2 and a ( 2) = 6 , 9'( 2 ) = -1. Find h'(2) if h ( x ) = f ( x x ) 9 ( x ) a ) 2 b ) Not enough enough ( ) - 9 D) 12 e ) - 16