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

[" If "f(x+2y,x-2y)=xy," then "f(x,y)" is equal to "],[[" 1) "(x^(2)-y^(2))/(8)," 2) "(x^(2)-y^(2))/(4)," 3) "(x^(2)+y^(2))/(4)," 4) "(x^(2)-y^(2))/(2)]]

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