Let f be a differentiable function such that f (1) = 2 and f ' (x) = f (x) for all xR. If h (x) = f(f(x)), then h'(1) is equal to
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f '(x) = f(x) ⇒ = y ⇒ ln y = x + c
y = λex ⇒ f(1) = 2
2 = λe ⇒ λ =
h'(1) = · e2 · e = 4e.