“1”在高中数学解题中往往扮演很重要的角色,若能适时巧妙地用上“1”的一些代换,将“1”进行转化,不但能让学生简化解题步骤,得到事半功倍的效果,还能极大地激发学生学习数学的兴趣.本文就“1”在解三角函数问题中的运用举例说明.妙用一巧妙运用边长为“1”的直角三角形,帮助记忆特殊角的三角函数值特殊角的三角函数值在解三角函数问题中应用非常广泛,而学生们往往容易记错,巧妙地运用边长为“1”的直角三角 “1 ” often plays a very important role in high school mathematics problem solving. If we can use some substitutions of “1 ” timely and skillfully to transform “1 ”, not only can students simplify the solution Problem, get a multiplier effect, but also greatly stimulate students interest in learning mathematics.This paper on the “1 ” in the solution to the problem of trigonometric functions as an example to illustrate the use of a clever use of a smart side length “1 ” Right-angled triangles, trigonometric functions that help memorize special angles The trigonometric values ​​at a particular angle are very versatile in solving trigonometric functions, and students tend to misrecognize them, using skillfully the right-angled triangles with sides “1”