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在传统的中学数学中,三角函数是比较重要的部分、但根据现行教学大纲的要求,已做了不少的删减,降低了同学们学习的难度.因此.高考对这部分内容的考查也做了相应的调整,由繁变简.从近几年各地的高考试题,不难看出,几乎都是围绕_二角函数的图象性质,用三角公式尤其是二倍角公式化简,正余弦定理这几个类型展开的.其中,求解三角函数图形变换是同学们的一个易错点.故,针对这类问题作以下分析
In the traditional middle school mathematics, the trigonometric function is an important part, but according to the requirements of the current syllabus, a lot of deletions have been made, which reduces the difficulty of the students’ learning. Therefore, the examination of this part of the college entrance examination is also The corresponding adjustments have been made. From the high-level examination questions in recent years, it is not difficult to see that almost all of them are based on the image properties of the _-diagonal function. The trigonometric formulae, especially the double-angled formula, are used to simplify the sine and cosine theorem. These types of expansions. Among them, the solution to the trigonometric graph transformation is an error-prone point for students. Therefore, the following analysis of these issues