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三角函数是高中数学中重要的初等函数之一,是沟通代数问题和几何问题的桥梁,是解决几何问题的有利工具,同时也是学好物理学科的必备知识。三角函数的图象和性质是许多学生最不容易记忆而又是海南高考每年必考的内容之一。
Trigonometric function is one of the important elementary functions in high school mathematics. It is a bridge between algebraic problems and geometric problems. It is an advantageous tool to solve the geometric problems and is also an essential knowledge to learn physics. The image and nature of the trigonometric function is one of the most important content that many students are not likely to remember but must pass the annual college entrance examination in Hainan.