论文部分内容阅读
在近几年的高考试题中,几乎都可见到三角形的身影,它们从不同角度展现三角形的丰富内涵,这些试题对于同学们的学习有很好的借鉴和指导作用.一、题型丰富,中规中矩,全面考查利用正弦定理、余弦定理、面积公式以及三角公式,解决基本的三角形问题.例1在△ABC中,A,B为锐角,角A,B,C所对应的边分别为a,b,c,且cos 2A=3/5,sinB=(10)~(1/2)/10
In recent years, college entrance examination examination questions, almost all can see the shadow figure of the triangle, they show the rich connotation of triangles from different angles, these questions for students to learn a good reference and guidance.A type of questions, law-abiding , A comprehensive examination of the use of sine, cosine theorem, area formula and triangular formula to solve the basic triangle problem.Example 1 In △ ABC, A, B for the acute angle, angle A, B, C corresponding to the sides were a, b , c, and cos 2A = 3/5, sinB = (10) ~ (1/2) / 10