Generally, trigonometric function in Hebei senior high school entrance examination will not be put forward separately. Usually, it is easy or difficult to study it together in big questions. Even if it is difficult, it is not difficult in itself. However, if we study multiple knowledge points at the same time, we can't find a breakthrough in this small knowledge point.

Therefore, when a person studies, it is necessary to clarify the problem-solving routines.

The content of trigonometric function in junior high school is a preliminary understanding of basic concepts and theorems, which will be further studied in senior high school. In the geometry part of junior high school mathematics, it mainly involves the content of plane geometry, which prepares the theoretical basis for the more difficult study of solid geometry in senior high school. So even the exam will not be too difficult.