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高中《代数》(甲种本)第一册“用单位圆中的线段表示三角函数”一节中,介绍了利用单位圆中的某些特定的有向线段的长度和方向表示三角函数值,通常称它们为三角函数线。三角函数线的引入对绘制三角函数的图象,研究三角函数的性质起了奠基作用,笔者认为,“三角函数线”是《三角》中的基本概念,如能更好地发挥“三角函数线”本身的直观性,那么许多问题的处理可
In the first volume of the first volume of “High School Algebra” (A type of book) for “Study of trigonometric functions with line segments in a unit circle”, the trigonometric function values are expressed using the length and direction of certain specific directed segments in the unit circle. They are usually called trigonometric function lines. The introduction of trigonometric function lines lays a foundation for the study of trigonometric function images and studies the nature of trigonometric functions. The author believes that “trigonometric function lines” is the basic concept in “triangular”, if it can better play “trigonometric function lines”. "Intuitive, so many problems can be handled