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f (x) = \frac{1}{\sqrt{4 - x^{2}}}

x < - 2, y > \frac{1}{2}

- 2 < x < 2, y \geq \frac{1}{2}

- 2 \leq x \leq 2, y < \frac{1}{2}

- x < - 2 & x >, - 2 < y < 2

ANS : 2

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