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

[" 7.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))/(4)" (d) none of these "]]

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