6) Consider a function f: R² → R, such that = y cos(xy). Which of the following are possible candidates for the function f? □ f(x, y) = sin(xy). □ f(x, y) = xy cos(xy). Of(x, y) = sin(xy) + xy. □ f(x, y) = sin(xy) + cos(y). □ f(x, y) = sin(xy) + □ f(x, y) = sin(xy) + (x), for some function (x). (y), for some function (y).

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