**
The function given is \( f(x, y) = \frac{\cos(x)}{1 - (x + y)} \). To find the tangent plane, we need the partial derivatives \( f_x \) and \( f_y \) at the point (0,0).
- **Partial derivative with respect to \( x \), \( f_x \):**
\[
f_x =
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