三角变形是培养学生等价转化思想、逻辑推理能力、思维的流畅性和灵活性的重要内容.它要求学生对三角公式要熟练掌握,弄清它的来龙去脉,以便在变形过程中,根据问题的不同情境,做出定向、合理的选择。 Triangle deformation is an important part of cultivating students’ equivalence in translation thinking, logical reasoning ability, and fluency and flexibility of thinking. It requires students to master the trigonometric formulae to understand its context, so that in the process of deformation, according to the problem Different situations, make targeted and reasonable choices.