The function $f(x)$ satisfies
\[f(x) - 2 f \left( \frac{1}{x} \right) = 4^x\]for all $x \neq 0.$  Find $f(2).$
Question:
The function $f(x)$ satisfies
\[f(x) - 2 f \left( \frac{1}{x} \right) = 4^x\]for all $x \neq 0.$  Find $f(2).$
Answer:
Let's think step by step.

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-\frac{20}{3}
The function $f(x)$ satisfies
\[f(x) - 2 f \left( \frac{1}{x} \right) = 4^x\]for all $x \neq 0.$  Find $f(2).$
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