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 1. Introduction

 2. Description of a question

 3. Diagram I

 4. Diagram II

 5. Mathematical description of the question

 6. Finding an equation I

 7. Finding an equation II

 8. Finding an equation III

 9. Differentiating the equation I

10. Differentiating the equation II

11. Answering the question I

12. Answering the question II

13. Answering the question III

14. Answering the question IV