# 150 Followers Question

Algebra Level 4

Suppose a function $$f : R → R$$ satisfi es the following conditions: $$(a) f(4xy) = 2y [f(x + y) + f(x -y)],$$ for all $$x, y ∈ R$$ $$(b) f(5) = 3$$.

Find the value of $$f(2015)$$.

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