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Return your final response within \boxed{}. In triangle $ABC$, $CA = CB$, and $D$ is the midpoint of $AB$. Line $EF$ passes through point $D$ such that triangles $ABC$ and $EFC$ share the same incenter. Prove that $DE \cdot DF = DA^2$.
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Deep Thought is thinking for 7.5 million years.

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<|begin_of_solution|>

1. **Identify Key Elements**: Consider \( \triangle ABC \) where \( CA = CB \) and \( D \) is the midpoint of \( AB \). Line \( \mathrm{EF} \) passes through \( D \) such that \( \triangle ABC \) and \( \triangle \mathrm{EFC} \) share the same incircle (inscribed circle).

2. **Given Common Incircle**: Let the shared incircle of \( \triangle ABC \) and \( \triangle \mathrm{EFC} \) be denoted by \( I \). 

3. **Excenter Involvement**: Assume that \( J \) is the \( C \)-excenter of \( \triangle ABC \). Thus, point \( J \) is also the \( C \)-excenter of \( \triangle \mathrm{EFC} \) because these two triangles share the same incircle.

4. **Properties of Excenters and Circumcenters**:
    - \( C, D, I, \) and \( J \) are collinear since \( D \) is the midpoint of \( AB \) and \( I \) is the incenter.
    - Because \( J \) is the excenter for both triangles at vertex \( C \), it lies on line \( \mathrm{CI} \).
    
5. **Midpoint Calculations**: Let \( \mathrm{K} \) be the midpoint of \( \mathrm{IJ} \). By properties of excircles and incenters in isosceles triangles:
    \[
    \mathrm{KI} = \mathrm{KJ} = K \text{A} = K \text{B} = K \text{E} = K \text{F}
    \]
    This relationship shows that all these points are equidistant to \( K \).

6. **Cyclic Hexagon Formation**: Hence, the points \( A, E, I, B, F, J \) form a cyclic hexagon because they lie on a common circle (i.e., they are concyclic).

7. **Power of a Point (for Point \( D \))**:
    - We apply the Power of a Point theorem at \( D \) for this cyclic hexagon:
    \[
    DE \cdot DF = DA \cdot DB
    \]
    Since \( D \) is the midpoint of \( AB \):
    \[
    DA = DB
    \]

8. **Simplification**: Thus, we have:
    \[
    DE \cdot DF = DA \cdot DA = DA^2
    \]

### Conclusion
\boxed{DE \cdot DF = DA^2}

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