38. f(x, y) = Vx 40. f(x, y) = Vx² + y² 42. Fx, y) — 4 - х? — у? 37. f(x, y) = y? 39. f(x, y) = x² + y? 41. f(x, y) = x² - y 43. f(x, y) %3D 4х? + y2 45. f(x, y) = 1 - \y| 47. f(x, y) = Vx² + y² + 4 | 44. f(x, y) = 6 – 2x Зу 46. f(x, y) = 1 - |x| – |y| 48. f(x, y) = Vx² + y² – 4

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Domain

In simple mathematics terms, a domain is defined as the space on which all the possible inputs for the function will lie. It can also be expressed as a set of departures for the required function.