(11,00 Puanlar)
2- What is the domain of the function $f(x, y) = \frac{1}{\sqrt{x^2 + y^2 - 9}} + \ln(2x + y)$?
a) $D = \{(x, y): x^2 + y^2 < 9 \text{ and } 0 < 2x + y\}$
b) $D = \{(x, y): x^2 + y^2 \ge 9 \text{ and } 0 < 2x + y\}$
c) $D = \{(x, y): x^2 + y^2 > 9 \text{ and } 0 < 2x + y\}$
d) $D = \{(x, y): x^2 + y^2 > 9 \text{ and } 0 \le 2x + y\}$
e) None