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三角函数的定义是三角学中最基本的概念之一。既是教材的重点,又是难点。这个概念掌握得如何,直接关系到三角的学习。下面对这个概念的教学提几点看法。一关于“角”的三角函数现行初中教材(通用教材)关于三角函数的概念是按照传统从几何方面把它作为角的函数而引进的,开始便用直角坐标给出了任意角三角函数的定义。但是,由于学生只有0°到360°角的概念,从解三角形的需要出发,实际上只是研究了0°到180°角的三角函数。再加上学生还没有
The definition of trigonometric functions is one of the most basic concepts in trigonometry. It is both the focus and the difficulty of teaching materials. How this concept is mastered is directly related to the learning of the triangle. Here are some ideas for teaching this concept. A trigonometric function of “angle” The current junior high school textbook (universal textbook) is about the concept of trigonometric functions. It was introduced from the geometric aspect as a function of the angle in the conventional way. At the beginning, the definition of the arbitrary angle trigonometric function is given by Cartesian coordinates. . However, since students only have the concept of an angle of 0° to 360°, starting from the need to solve triangles, only trigonometric functions of 0° to 180° are actually studied. Plus the students haven’t