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[" If "f(x+2y,x-2y)=xy," then "f(x,y)" e...

[" If "f(x+2y,x-2y)=xy," then "f(x,y)" equals "],[[" (A) "(x^(2)-y^(2))/(8)," (B) "(x^(2)-y^(2))/(4)],[" (C) "(x^(2)+y^(2))/(1)," (D) "(x^(2)-y^(2))/(2)]]

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