Consider the function f ( x ) {\displaystyle f(x)} (solid curve) and its tangent line at x = 4 {\displaystyle x=4} (dashed). The graph of f ( x ) {\displaystyle f(x)} is symmetric about x = 2 {\displaystyle x=2} . Calculate the quantities below.
(b) If g ( x ) = f ( f ( x ) ) {\displaystyle g(x)=f(f(x))} , then g ′ ( 4 ) {\displaystyle g'(4)}
