As far as high school mathematics is concerned, trigonometric function is definitely more important than any algorithm or probability. So, you must study hard! At that time, when we studied high school mathematics, we had to study compulsory one first, then compulsory four, and finally compulsory two or three. The most important thing in senior high school mathematics is function, and the idea of function runs through senior high school mathematics, especially the elementary function of compulsory one and trigonometric function of compulsory four. Also, you will learn conic section, calculus, inequality selection and so on. In your later elective courses, these are all related to functions to varying degrees in solving problems. At the same time, in the future study, you will find the extensive application of trigonometric function and the powerful function of trigonometric function tools in solving problems! In short, study hard! Wish you success!