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三角函数是高考的考查热点,命题的一般模式为一个客观题和一个解答题,其中客观题一般多为基础题,解答题为中档题.解答题多为三角函数与三角变换的综合问题或三角函数与其他知识的交汇问题.三角变换是运算、化简、求值、证明过程中不可缺少的解题技巧,公式正用要善于拆角;逆用要构造公式结构;变用要抓住公式结构,要学会创设条件灵活运用三角公式,掌握运算、化简的方法和技能.解三角形的内容不仅能考查正、余弦定理的应用,而且能很好地考查三角变换的技巧,它还可与立体几何、解析几何、向量、数列、概率等知识相结合,这其中经常涉及数形结合、分类讨论及等价转化等思想方法;主要考查运用正弦定理、余弦定理探求任意三角形的边角关系,解决与之有关的计算问题;运用这两个定理解决一些与测量以及几何运算有关的实际问题.
The trigonometric function is the examination hot spot of entrance examination, the general mode of proposition is an objective question and a solution question, among them the objective question is mostly based on the question, the answer question is the mid-range question. The answer question is mostly the synthesis question of trigonometric function and triangle transformation or triangle Function and other knowledge intersection problem.Change transformation is the operation, simplification, evaluation, proof process indispensable problem-solving skills, the formula is used to be good at removing the angle; reverse to construct the formula structure; change to take the formula Structure, learn to create conditions to flexibly use trigonometric formulas to master the methods and skills of computing and simplification.Constructing the content of triangles can not only examine the application of positive and cosine theorems, but also test the technique of trigonometric transformation well, This involves the combination of number and form, classification and discussion of equivalence transformation and other methods of thinking; the main test using the sine, cosine theorem to explore the relationship between the edges of any triangle, Solve the computational problems associated with it; apply these two theorems to solve some practical problems related to measurement and geometry.