Decide the domain for the following functions, by sketching:

f(x, y) = ln |xy|, g(x, y) = 1/ (x^2 − y) , h(x, y) = (x − y)^0.5, k(x, y) = (xy)^0.5,

t(x, y) = (1 − x^2 − y^2)^0.5 ((ln (x^2 + y^2 )) , s(x, y) = log(x/y), p(x) = arctan(y/x)

Which of this domains are open, closed or neither?

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