学习锐角三角函数应充分发挥数形结合这一数学思想武器,在理解概念、推理论证、计算化简的过程中要注重通过画图来帮助分析,通过观察图形感受直角三角形边与角之间的关系,从而强化我们在生活、生产(如测量、航海、工程技术等)中应用数学的意识. Learning the acute angle trigonometric function should make full use of the mathematics ideological weapon of combination of numbers and shapes. In the process of understanding concepts, deriving theoretical evidence, and simplifying calculations, it is necessary to pay attention to assisting analysis through drawing, and to experience the relationship between the sides and angles of right triangles by observing patterns. , thus strengthening our awareness of applied mathematics in life, production (such as measurement, navigation, engineering, etc.).