Let $f : \mathbb{R} \to \mathbb{R}$ be a function such that $f(5) = 3$ and
\[f(4xy) = 2y[f(x + y) + f(x - y)]\]for all real numbers $x$ and $y.$  Find $f(2015).$
Question:
Let $f : \mathbb{R} \to \mathbb{R}$ be a function such that $f(5) = 3$ and
\[f(4xy) = 2y[f(x + y) + f(x - y)]\]for all real numbers $x$ and $y.$  Find $f(2015).$
Answer:
Let's think step by step.

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Let $f : \mathbb{R} \to \mathbb{R}$ be a function such that $f(5) = 3$ and
\[f(4xy) = 2y[f(x + y) + f(x - y)]\]for all real numbers $x$ and $y.$  Find $f(2015).$
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