三角函数求值是高中教材的一个重要内容,也是高考中常见的考点,这类习题灵活性强,解题思路有时不容易找到,难于把握,所以每年高考中此类试题得分效果并不理想,下面就几道例题来说明这类试题的一些常见解法。一、削减一般角,凑配特殊角例1 (1987年高考题)求sin10°sin30° Trigonometric function evaluation is an important content of high school textbooks, and it is also a common test site in college entrance examinations. Such exercises are highly flexible, and the problem-solving ideas are sometimes not easy to find and difficult to grasp. Therefore, the scores of such questions in the annual college entrance examination are not satisfactory. Here are a few examples to illustrate some of the common solutions to such questions. First, reduce the general angle, make up a special corner case 1 (1987 college entrance examination questions) seeking sin10 ° sin30 °