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Applications of AutoCAD in mechanical engineering include:

1. **2D Drafting**: Creating detailed technical drawings.

2. **3D Modeling**: Designing complex parts and assemblies.

3. **Simulation**: Visualizing and testing designs.

4. **Product Documentation**: Generating specifications and assembly instructions.

5. **Manufacturing Layouts**: Planning factory layouts and workflows.

Some of the best books for learning AutoCAD are:

1. **"AutoCAD 2022 for Beginners" by CADArtifex**

2. **"Mastering AutoCAD 2022 and AutoCAD LT 2022" by Brian C. Benton**

3. **"AutoCAD in Simple Steps" by Ryan Turner**

4. **"AutoCAD 2022: A Problem-Solving Approach" by Sham Tickoo**

Basic commands in AutoCAD include:

1. **LINE**: Draw straight lines.

2. **CIRCLE**: Create circles.

3. **RECTANGLE**: Draw rectangles.

4. **POLYLINE**: Create continuous lines or shapes.

5. **TRIM**: Cut objects to a defined boundary.

6. **EXTEND**: Lengthen objects to meet other objects.

7. **COPY**: Duplicate objects.

8. **MOVE**: Relocate objects.

9. **ROTATE**: Turn objects around a base point.

10. **DIMLINEAR**: Add linear dimensions.

These commands form the foundation for creating and editing drawings in AutoCAD.