三角函数是2004年全国和各省、市高考的 “热点”之一.其命题突出了活、新、变的特点. 本文择重点题型为例,介绍其考查的要点. 1.考查三角函数的概念 考查三角函数的定义域、值域和同角三角 函数关系,以及诱导公式的应用,是考试中的 客观题型之一. 例1(2004年辽宁)若cosθ>0,且sin2θ <0,则角θ的终边所在象限是( ). The trigonometric function is one of the “hot spots” in the national and provincial colleges and universities in 2004. Its proposition highlights the characteristics of living, new, and changing. This paper selects key questions as an example to introduce the points of its examination. The concept of function is to examine the trigonometric function’s definition domain, value domain and homogonal trigonometric function relations, and the application of the induction formula. It is one of the objective questions in the exam. Example 1 (Liaoning, 2004) If cosθ>0 and sin2θ < 0, then the quadrant of the angle θ lies in ().