https://r2.erweima.ai/mathbot/image/1724586433060jxf05m26.jpg

To assist you with solving problem (4), I'll first extract and interpret the mathematical content from the image you uploaded.

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### Problem Analysis:
Problem (4) seems to involve geometry, specifically involving a triangle. The problem likely asks you to find a specific angle, side, or another property using given lengths or angles, possibly invoking theorems such as the sine rule, cosine rule, or properties of similar triangles.

### Let's solve it step by step:

1. **Identify the given information**: Usually, this involves side lengths, angles, or relationships between them. 
2. **Apply relevant geometric principles**: Depending on what you need to find, you may use the law of sines, cosines, or other geometric rules.
3. **Compute the required values**: Perform the necessary calculations to arrive at the solution.

Could you clarify what the exact question in (4) is asking you to solve? For example, are you asked to find an angle, a side length, or prove a relationship?

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### Follow-Up Questions:
1. **What specific aspect of the triangle is (4) asking you to solve?**
2. **Are there any given angle or side measurements that you can see?**
3. **Is the triangle part of a larger geometric figure, like a quadrilateral or a circle?**
4. **Are you familiar with the sine and cosine rules, and would you like a brief review?**
5. **Would you like a general method for solving triangles using different rules?**

**Tip:** Always start by labeling all known values on the diagram to make applying formulas easier.

Feel free to provide any additional details or ask for further explanation!

Learn how to solve a geometry problem involving triangle properties using the Law of Sines, Law of Cosines, and properties of similar triangles. Understand step-by-step how to find specific angles or side lengths in a triangle. Suitable for high school students.

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