According to the query computer learning network, trigonometric function is an introduction to right triangle mathematics knowledge, starting from the ninth grade. Trigonometric function can be said to be a difficult course in junior high school mathematics. Therefore, when children learn this knowledge, they must follow the teacher's rhythm, pay attention to classroom and after-school exercises, study hard and lay a good foundation.

To learn trigonometric functions, we must make full use of the combination of numbers and shapes to solve problems. We must link the figures of trigonometric functions with the definition of coordinates, then find the pointer to this problem, and then turn algebraic problems in mathematics into geometric problems on coordinate axes. Then the number and shape are combined in the coordinate system, and the number and shape are combined to solve the problem. Generally speaking, in the method of solving trigonometric functions by combining numbers and shapes, the commonly used algebraic-to-geometric problem-solving models are mainly distance model and slope model.