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[" EXAMPLE "9" If "f(x+y,x-y)=xy" ,then ...

[" EXAMPLE "9" If "f(x+y,x-y)=xy" ,then "(f(x,y)+f(y,x))/(2)=],[[" (a) "x," (b) "y," (c) "0," (d) none of these "],[" Ans.(c) "]]

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