Four contour maps are shown. One is for the function f(x, y) = cos(x – y) + cos(x + y). Which is it? 0.80 0.40 -0.80 0.00 0.00 1.20 1.60 1 0.80 -0.40 0.40 -1 -0.40 0.80 0.40 20 1.60 -2 -3 -3 -2 1 2 3 0.00 -0.80 0.80 0.80 08'0 0.00 1.20 -19.40

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