If `f (x+y x-y) = xy` then the arithmetic mean of `f(xy) and f(y x)` isA. xB. yC. 0D. `(x^(2)-y^(2))(2)`

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1.	If `f (x+y, x-y) = xy`, then the arithmetic mean of `f(x,y) and f(y, x)` isA. xB. yC. 0D. `(x^(2)-y^(2))/(2)`
Answer» Correct Answer - C

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If `f (x+y, x-y) = xy`, then the arithmetic mean of `f(x,y) and f(y, x)` isA. xB. yC. 0D. `(x^(2)-y^(2))/(2)`