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The problem involves a square \( ABCD \) with several geometric constructions. Let's break down and interpret the given information and the tasks.

1. The square is \( ABCD \), and points \( M \) and \( N \) are inside the square.
2. We are given that triangle \( MCD \) is equilateral.
3. The problem defines the following intersections:
   - \( AC \) intersects \( MD \) at \( E \),
   - Line parallel to \( AB \) through \( M \) intersects \( DM \) at \( F \),
   - Line parallel to \( CD \) through \( M \) intersects \( AM \) at \( N \).

### The tasks are:
1. Prove that \( \angle AMB = 150^\circ \) and \( DN = 2AN \).
2. Prove that line \( BE \) passes through the midpoint of \( MF \).

### Step 1: Analyze the structure of the square and angles.
- Since \( ABCD \) is a square, \( AB \parallel CD \), \( AD \parallel BC \), and all sides are equal.
- Since \( MCD \) is equilateral, all angles in this triangle are \( 60^\circ \).

### Task 1: Prove that \( \angle AMB = 150^\circ \).
To solve this:
- Start by considering the properties of the equilateral triangle \( MCD \). 
- The position of point \( M \) inside the square implies certain symmetry relationships and angle properties. We will need to consider how the diagonals \( AC \) and \( BD \) interact with the points and lines involved.

### Task 2: Prove that \( DN = 2AN \).
- This can be tackled using the properties of similar triangles or coordinate geometry, depending on the positioning of \( N \).

### Task 3: Prove that \( BE \) passes through the midpoint of \( MF \).
- This involves showing a specific relationship between the segments \( BE \) and \( MF \). Using properties of parallelograms or triangles and applying midline theorems could help prove this result.

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This geometry problem requires the application of several key concepts: equilateral triangles, properties of squares, parallel lines, and angle chasing. Let's start by solving the angles and working through the steps systematically.

Do you have any particular part you'd like more details on, or should I walk through the proofs one by one?

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Here are 5 questions related to this problem:
1. How do equilateral triangles relate to the angles within a square?
2. What properties of squares are most useful when solving geometric intersection problems?
3. How can coordinate geometry be used to solve problems involving midpoints?
4. What is the significance of parallel lines in geometric proofs?
5. How can we apply the law of cosines to calculate angles in polygons?

**Tip**: Always draw additional auxiliary lines if the given configuration seems complex. This often simplifies the geometry problem.

Bài 6: Cho hình vuông và điểm M nằm trong hình vuông sao cho MCD là tam giác đều. Giả sử AC cắt MD tại E. Đường thẳng song song với AB cắt DM tại F. Đường thẳng song song với CD cắt AM tại N.

Solve a geometry problem involving a square with an equilateral triangle MCD, where you need to prove angle AMB is 150°, DN = 2AN, and that line BE passes through the midpoint of MF. Learn how to apply geometric theorems and properties of squares and triangles.

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