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三角函数是基本初等函数中的一个重要内容,同时也是高考的重点与热点。下面举例予以说明三角变换的常用解题策略,仅供大家参考。一、角的变换——变未知角为已知角在三角函数的求值、化简与证明题中,表达式往往出现较多的相异角,此时可根据角与角之间的和差、倍半、互余、互补的关系,运用角的变换,沟通条件与结论中角的差异,使问题获解。常见角的变换方式有:α=(α+β)-β;
Trigonometric function is an elementary elementary function in an important part, but also the focus and hot college entrance examination. The following examples illustrate the common triangle triangle transformation problem strategy, for your reference. First, the angle of the transformation - to change the unknown angle known angle In the trigonometric function evaluation, simplification and proof of the problem, the expression often appear more different angles, at this time according to the angle and the angle between Poor, half, reciprocal and complementary relations, the use of angular transformation, communication conditions and the conclusions of the corner of the difference, so that the problem is solved. Common corner of the transformation are: α = (α + β) -β;