Mathematics IV (compulsory) includes trigonometric function, plane vector and trigonometric identity transformation.
Trigonometric function is an important mathematical model to describe periodic phenomena and plays an important role in mathematics and other fields. This is the last basic elementary function that students study in senior high school. Vector is one of the important and basic mathematical concepts in modern mathematics. It is a tool to communicate algebra, geometry and trigonometric functions. It has an extremely rich practical background and is widely used in mathematics and physics. Trigonometric identity transformation has certain application in mathematics.
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