If f(x) = x + 2, then f'(f(x)) at x = 4 is - Vidyadip

Question

If $f(x) = x + 2,$ then $f'(f(x))$ at $x = 4$ is

✓

Answer

b
(b) $f(x) = x + 2$ ==> $f'(x) = 1$

$\therefore$ $f'(f(x)) = f'(x + 2) = 1$ at $x = 4$.

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