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在学习三角恒等变换中要注意以下几个问题:(1)使用公式证明和化简时,除了要注意所用的公式正确无误之外,还要注意分析变形的方向,如向同角三角函数的转化、向同名三角函数的转化;(2)要注意三角公式与代数有关公式的综合应用,还要注意三角变形方法与代数变形方法的综合应用;(3)解三角证明问题和解其他证明题的方法一样,可以从右向左,也可以从左向右证明或等式两边向同形式变形;(4)学习中要充分领会数形结合以及化
In the learning of triangular identity transformation, we should pay attention to the following questions: (1) When using formula to prove and simplify, besides paying attention to the correct formula, we should also pay attention to analyze the deformation direction, such as to the trigonometric trigonometrical function (2) We should pay attention to the application of the formula of trigonometric formula and algebra, and pay attention to the comprehensive application of the triangle deformation method and the algebra deformation method. (3) Solve the triangular proof problem and other proof problems The same way, you can from right to left, you can prove from left to right or both sides of the equation deformation to the same form; (4) learning to fully understand the combination of digital and