Vector is the simplest chapter of high school mathematics, which is simpler than trigonometric function. The vector in mathematics, like the vector in physics, is simply a directed line segment. They can add and subtract according to the rules of triangles and parallelograms.

When you use vectors in the coordinate system, you will find it very simple, just like answering junior high school, you only need pure calculation.

Vector is mainly used to solve space geometry problems in senior high school. As long as the space coordinate system is established and vectors are used, any problem can be solved easily.

This is a new field, which was put forward by a high school student. But later, for some unknown reason, this high school student died young. Unfortunately, the day is over.