[" If "f(x+ay,x-ay)=axy," then "f(x,y)" ...

[" If "f(x+ay,x-ay)=axy," then "f(x,y)" is equal to "],[[" (a) "xy," (b) "x^(2)-a^(2)y^(2)],[" (c) "(x^(2)-y^(2))/(4)," (d) none of these "]]

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