以Rt△ABC两锐角A、B的三角函数为根(或系数)的一元二次方程问题,常出现在近几年各地的中考试题中.这类题目把一元二次方程的知识与三角函数的知识组合在一起,综 The problem of quadratic equations with the root (or coefficient) of the two sharp angles A and B of Rt △ ABC is often present in the mid-test questions in recent years. These types of questions have the knowledge of quadratic equations and trigonometric functions. The knowledge is combined together