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课题:三角函数式的化简和求值适用年级:高三年级学期:2006～2007学年度第一学期要点提示三角函数式的化简和求值考查了众多的三角公式的灵活运用和解题突破口的合理选择．认真分析所求式子的整体结构,分析各个三角函数及角的相互关系是灵活运用公式的基础,是恰当寻找解题思维起点的关键所在．注意以下几个三角恒等变形和常用技巧,会使我们解题正确、合理、迅速．
Topic: Simplification and evaluation of trigonometric functions Applicable grades: High grade 3 Term: 2006-2007 First semester Highlights Tips for trigonometric function reductions and evaluations Extensive use of trigonometric formulas and problem solving Reasonable choice. The analysis of the overall structure of the proposed formula and the analysis of the relationship between the trigonometric functions and the angles are the basis for the flexible use of formulas and are the key to finding the starting point for problem solving. Note the following trigonometric constant deformations and common techniques that will allow us to solve the problem correctly, reasonably, and quickly.