(a) find the function’s domain, (b) find the function’srange, (c) describe the function’s level curves, (d) find theboundary of the function’s domain, (e) determine whether the domainis an open region, a closed region, or neither, and (f) decide whetherthe domain is bounded or unbounded. ƒ(x, y) = ln (9 - x2 - y2)

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