Consider the following table of values of the functions f and g and their derivatives at various points. a. Find Dx(fig(x)]) at x=1. b. Find Dx(g[f(x)]) at x=4. 23 32640 4 1 X 1 f(x) 4 f'(x) -7 -3 -6 -8 g(x) 1 2 3 g'(x) 1/9 19 7/9 8/9 5/9 Dx(fig(x)]) at x=1 is (Type an integer or a simplified fraction.) Dx(g[f(x)]) at x=4 is (Type an integer or a simplified fraction.)