Question: If f ( x ) = c o s ( 3 x ) , then f ' ( 9 ) = ( A ) 3

If f(x)=cos(3x), then f'(9)=
(A)3322
(B)322
(C)-322
(D)-32
(E)-3322
If f ( x ) = c o s ( 3 x ) , then f ' ( 9 ) = ( A

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