Let \( f \) be a differentiable function satisfying
\[
[f(x)]^{n}=f(n x) \text { for all } x \in... VIDEO
Let \( f \) be a differentiable function satisfying
\[
[f(x)]^{n}=f(n x) \text { for all } x \in R
\]
Then, \( f^{\prime}(x) f(n x) \) equals
(a) \( f(x) \)
(b) 0
(c) \( f(x) f^{\prime}(n x) \)
(d) None of these
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