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The document you provided contains a set of trigonometric exercises and multiple-choice questions in Vietnamese, covering topics like:

1. Length of circular arcs.
2. Trigonometric identities and simplifications.
3. Values of trigonometric expressions for specific angles.
4. Domain and range of trigonometric functions.
5. Symmetry of functions and identifying even/odd properties.

Would you like a specific question from this document solved or explained in detail?

Here are some questions that expand on this content:
1. How do you calculate the length of a circular arc given its radius and central angle?
2. What are the main trigonometric identities useful for simplifying expressions?
3. How can we determine if a trigonometric function is even or odd?
4. How is the domain of trigonometric functions defined?
5. What techniques are used to solve trigonometric equations efficiently?

**Tip**: Remember that even trigonometric functions like \( \cos(\theta) \) have symmetry about the y-axis, while odd functions like \( \sin(\theta) \) are symmetric about the origin.

The document contains trigonometric exercises in Vietnamese, focusing on topics such as length of circular arcs, trigonometric identities, and even/odd properties of functions.

This page provides detailed explanations on calculating the length of circular arcs, understanding trigonometric identities, and identifying even/odd functions. It is suitable for high school students learning advanced trigonometry.

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