Define the following function : f(x, y) = (x+y) ÷ 2, g(x, y) = x2 – y2 and h(x, y) = (x – y) ÷ 2, Which of the followings has a value 0.25 for x = 0 and y = 0.5 ?

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Define the following function : f(x, y) = (x+y) ÷ 2, g(x, y) = x2 – y2 and h(x, y) = (x – y) ÷ 2, Which of the followings has a value 0.25 for x = 0 and y = 0.5 ?