Let $f(x) = x^2 - 4\sqrt{x} + 1$. What is $f(f(4))$?
Question:
Let $f(x) = x^2 - 4\sqrt{x} + 1$. What is $f(f(4))$?
Answer:
Let's think step by step.

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Let $f(x) = x^2 - 4\sqrt{x} + 1$. What is $f(f(4))$?
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