三角变换方法及技巧

• 作 者: 徐小巧
• 机 构: 河南省鲁山县第一高级中学,
• 出 处: 小学生(教学实践)
• 发表日期: 2012年01期
• 关键词: 诱导公式 解题策略 必考内容 变换方法 变换问题 函数求值 证明过程 已知条件 中所

三角变换是三角函数求值、化简、证明过程中最常用的手段,也是高考必考内容.三角变换以其纷繁复杂的公式、多变的题型,让同学们颇感困难.通常要掌握三角变换问题的解题策略,我们可以从四个字入手,即“角”、“名”、“形”、“幂”.一、角的变换在三角变换中,往往会出现不同的角,可根据角与角之间的和、差、倍、半等关系及诱导公式,运用角的变换,沟通条件与结论中角的

Triangular transformation is the trigonometric function evaluation, simplification, the most commonly used means to prove the process, but also the college entrance examination content. Triangle transformation with its numerous and complex formulas, changing questions, so that students quite difficult. Triangular transformation problem solving strategy, we can start from the four words, namely “angle ”, “name ”, “shape ”, “power ” First, the transformation of the angle In the triangular transformation , There will often be different angles, according to the angle and angle between the sum, difference, times, semi-relationship and the induction formula, the use of angular transformation, communication conditions and conclusions of the corner