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Omni-MATH / Find all functions f:R→R such that for all real numbers x and y , (f(x)+xy)⋅f(x−3y)+(f(y)+xy)⋅f(3x−y)=(f(x+y))². · Discussion

Discussing Find all functions f:R→R such that for all real numbers x and y , (f(x)+xy)⋅f(x−3y)+(f(y)+xy)⋅f(3x−y)=(f(x+y))². · Omni-MATH

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