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What are the practical applications of mathematics?
Mathematics is a basic subject, and its application widely exists in all aspects of our lives. The following are some specific application areas:

1. engineering and technology: in the fields of architecture, aviation, electronics and computer science, mathematics is used to design and optimize systems. For example, engineers use calculus to understand and solve physical problems such as force, motion and energy. In computer science, the design of algorithms and data structures often depends on discrete mathematics.

2. Economics and Finance: Statistics is the core tool in these two fields. Economists use statistical models to predict economic trends, while financial analysts use complex mathematical models to evaluate investment risks and returns.

3. Medicine and biology: In these two fields, mathematics is used to understand the complexity of biological processes. For example, probability theory is used to estimate the incidence of diseases, and linear algebra and calculus are used to understand the dynamic behavior of biological systems.

4. Social Science: In the fields of psychology, sociology and political science, mathematics is used to analyze and explain human behavior and social phenomena. For example, sociologists use mathematical models to study group behavior and social networks.

5. Physics: Physics is an important application field of mathematics. Physicists use mathematics to describe and predict natural phenomena, such as quantum mechanics, relativity and cosmology.

Generally speaking, mathematics is a universal language, which helps us to understand and solve problems in the real world. Mathematics plays an important role in scientific research, engineering design and business decision-making.