巧用三角函数线解题２０１５００上海市金山县中学戴丽萍在现行全国统编教材的三角内容中，介绍了用单位圆上的有向线段──三角函数线来表示三角函数．但教材限于篇幅对三角函数线的应用，仅在描绘三角函数的图象，探究三角函数的性质时作了部分应用．如在解题时，能恰当... Clever use of trigonometric function to solve the problem 201500 Shanghai Jinshan County Middle School Dai Liping in the current triangulation of national textbooks, describes the use of a straight line on the unit circle - the triangular function line to represent the trigonometric function. However, teaching materials are limited in length to the application of trigonometric function lines. They have only been applied to the trigonometric functions and explore the nature of trigonometric functions. If you solve the problem, you can properly...