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Domain of a Surface

Give the domain for f(x, y) = ln ( 1 - x^(2) - y^(2)) .

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Solution. For function y=ln x, we know that x must be positive.
So, for f(x, y) = ln ( 1 - ...

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The domain of a surface is found. The solution is detailed and well presented. The response received a rating of "5/5" from the student who originally posted the question.