" (2) Arithmetic mean of "x^(2)+3xy" and "y^(2)-3xy" is "

If f(x+y,x-y) =xy , then the arithmetic mean of f(x,y) and f(y,-x) is

If f(x+y,x-y)=xy, then the arithmetic mean of f(x,y) and f(y,-x) is

If f(x+y,x-y)=xy then the arithmetic mean of f(x,y) and f(y,x) is

If f(x + y, x-y) = xy then the arithmetic mean of f(x, y) and f(y, x) is

If f(x + y, x-y) = xy then the arithmetic mean of f(x, y) and f(y, x) is

If f (x+y, x-y)=xy, then the arithmetic mean of f (x,y) and f(y,x) is-

Subtract the sum of 7x^(2) - 4y^(2) " and " 4x^(2) + 3xy - 4y^(2) from the sum of 5x^(2) - 3xy - y^(2) "and " x^(2) + 2xy - 2y^(2) .

If f(x+y,x-y)=xy then the arithmetic mean of f(y, x) & f(x,y)

Add 5x^(2)+3xy+2y^(2)" and "2y^(2)-xy+4x^(2)