论文部分内容阅读
实践证明,在证明三角恒等式或求三角式 的值的问题中,同学们一般都是把注意力集中 到如何根据已知条件,应用三角公式,通过恒 等变形去实现问题的解,往往忽视了角的拆凑 变化在解题中的重要作用.其实有一些三角问 题,只要留心观察题目中角度的特点,联想所 学的公式,灵活地采取拆角凑角的方法,那么 就可获得新颖简捷的解法. 下面略举几例加以说明.
Practice has proved that in the problem of proving the trigonometric identities or trigonometric values, the students are generally focused on how to apply the trigonometric formulas according to the known conditions and solve the problems through the isomorphic deformation, often ignoring the problem. The important role of corner deletion and patching in solving problems. There are actually some triangulation problems, as long as you pay attention to the characteristics of the angles in the observations, and formulate the formulas learned by the association, and adopt a flexible method of splitting the corners and corners. The solution. Here are a few examples to illustrate.