We have $4x^2 + 9y^2 - 36$.
To determine the region of continuity, we need to find the values of $x$ and $y$ for which the denominator is not equal to zero.
Setting the denominator equal to zero, we have:
$4x^2 + 9y^2 - 36 = 0$
Simplifying, we get:
$4x^2 +
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