h(x)= f(g(x))

==> h'(x)= g'(x) * f'(g(x))

==> h'(2)= g'(2) * f'(g(2))

==> h'(2)= 2 * f'(4)

==> h'(2)= 2* 4 = 8

==> h'(2)= 8

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