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三角公式很多 ,变幻莫测 ,在解题中如何把握好变换的方向 ,有目的地进行三角恒等变换是学好三角的关键 .本文介绍三角恒等变换的一些策略 .策略 1 变换角三角变换中经常要化复角为单角 ,化未知角为已知角 .因此 ,看准角与角的关系 ,十分重要 .哪些角消失了 ,哪些角变化了 ,结
There are many trigonometric formulas and they are unpredictable. How to grasp the direction of transformation in the problem-solving problem. The purpose of triangular identity transformation is the key to learning the triangle. This paper introduces some strategies of triangular identity transformation. Strategy 1 Transforming angles in trigonometric transformation It is often necessary to convert the complex angle to a single angle, and the unknown angle is known as the angle. Therefore, it is very important to look at the relationship between the angle and the angle. Which angles have disappeared and which angles have changed.