1. Find and sketch the domain for each function:
(i) f(x, y) = sqrt(y - x - 2)
(ii) f(x, y) = ln(x ^ 2 + y ^ 2 - 4)
Ans: (i) Domain: all points (x, y) on or above line y = x + 2
(ii) Domain: x ^ 2 + y ^ 2 > 4
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