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The problem asks to use implicit differentiation to find points where the given parabola has horizontal and vertical tangent lines. The equation of the parabola is:

\[
x^2 - 2xy + y^2 - 4y + 4 = 0
\]

### Steps to Solve:

1. **Implicit Differentiation**:
   Differentiate both sides of the equation implicitly with respect to \(x\), treating \(y\) as a function of \(x\) (i.e., applying the chain rule where necessary).

   \[
   \frac{d}{dx}(x^2) - \frac{d}{dx}(2xy) + \frac{d}{dx}(y^2) - \frac{d}{dx}(4y) + \frac{d}{dx}(4) = 0
   \]

   This gives:
   \[
   2x - 2 \left( y + x\frac{dy}{dx} \right) + 2y\frac{dy}{dx} - 4\frac{dy}{dx} = 0
   \]

2. **Simplify the Expression**:
   Simplify the differentiated equation to solve for \(\frac{dy}{dx}\):
   \[
   2x - 2y - 2x\frac{dy}{dx} + 2y\frac{dy}{dx} - 4\frac{dy}{dx} = 0
   \]
   Combine like terms:
   \[
   2x - 2y = \left( 2x - 2y + 4 \right) \frac{dy}{dx}
   \]
   Now solve for \(\frac{dy}{dx}\):
   \[
   \frac{dy}{dx} = \frac{2x - 2y}{2x - 2y + 4}
   \]

3. **Conditions for Horizontal and Vertical Tangents**:
   - Horizontal tangents occur when \(\frac{dy}{dx} = 0\). This happens when the numerator \(2x - 2y = 0\), or \(x = y\).
   - Vertical tangents occur when the denominator \(2x - 2y + 4 = 0\), or \(x - y = -2\).

4. **Find the Points**:
   - For horizontal tangents, set \(x = y\) in the original equation to find the points.
   - For vertical tangents, set \(x - y = -2\) in the original equation to find the points.

Would you like to see the calculations for the specific points where the parabola has horizontal and vertical tangents?

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### Related Questions:
1. How can we apply implicit differentiation to other types of curves?
2. What is the geometric interpretation of horizontal and vertical tangents?
3. How does the chain rule work in implicit differentiation?
4. What happens at points where both horizontal and vertical tangents exist?
5. Can this method be applied to find tangent lines for curves defined parametrically?

**Tip**: When applying implicit differentiation, always remember to treat \(y\) as a function of \(x\) and apply the chain rule appropriately.

Use implicit differentiation to find the points where the parabola defined by x^2 - 2xy + y^2 - 4y + 4 = 0 has horizontal and vertical tangent lines.

Learn how to find points where the parabola x^2 - 2xy + y^2 - 4y + 4 = 0 has horizontal and vertical tangents using implicit differentiation. This problem explores the application of the chain rule and solving for dy/dx.

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