34-39 - Draw a contour map of the function showing several level curves. x + y 34. f(x, y) = - 35. f(x, y) = x- y 36. f(х, у) — у -сos x 37. f(x, y) = e+y}) 38. f(x, y) = x² + 9y² 39. f(x, y) = e"

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