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(y, x) & f(x,y)

If f(2x + 3y, 2x-3y)=4xy , then find the value of f(x,y)

If f(x+2y,x-2y)=xy, then f(x,y) equals

If f(x + 2y, x-2y) =xy , then f(x,y) is equal to:

If f(x+2y,x-2y)=xy then f(x,y) is equal to

If f(x+2y,x-2y) =xy, then f(x,y) is equal to

If f(x) = cos(log_e x) , then find the value of f(x) cdot f(y) - 1/2[f(x/y) + f(xy)]

if f(x) = cos (log x) then the value of f(x) f(y)-(1//2) [f(x//y) + f(xy) ] is

For each of the functions find the f _(x), f _(y), and show that f _(xy) = f _(yx). f (x,y) = (3x)/( y + sin x)