讲解这道题 反函数求导---**Question:** Find $(f^{-1})'(a)$. **Function Definition:** $f(x) = 4x^3 + 4 \sin(x) + 2 \cos(x)$ **Value of a:** $a = 2$ **Answer Input Area:** $(f^{-1})'(a) = \boxed{\frac{1}{4}}$ **Checkmark:** [Green checkmark indicating the provided answer is correct]

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