三角函数的求值问题是三角这部分内容中的热点题型,它既能综合考查角的变换、三角函数的名称变换、次数变换、三角函数表达形式的变换等基础知识,又能考查灵活运用公式、合理选用公式、准确选择解题方向等思维能力,因此在高考中备受青睐.其试题基本以基础题或中档题为主,有时会与其他数学知识(如向量、不等式、解析 The problem of trigonometric function evaluation is a hot topic in this part of the triangle. It can not only comprehensively examine the angle transformation, name transformation of trigonometric functions, number of transformations, transformation of trigonometric functions, but also can be used flexibly. Formulas, rational selection of formulas, and the ability to choose the direction of the problem, such as the ability to accurately select questions, are therefore highly favored in the college entrance examination. The questions are basically based on the basic questions or mid-range questions, sometimes with other mathematical knowledge (such as vector, inequality, analysis