三角函数的等效变换涉及到很多公式,还包括三角形中正弦定理与余弦定理,因此我们需要花很多的时间与精力去消化和吸收理解这些公式,才能做到真正的融会贯通.一、从题目类型的角度解析三角函数1.三角函数的等效变换问题在处理这类问题时,我们除了要熟记常用的具体三角函数公式(例如倍角与半角公式,积化和差与和差化积公式),还要针对具体的题目进行适当的分析,不能盲目地代用公式,首先解决这类问题要有“化归”思想,就是把复杂的三角 The equivalent transformation of trigonometric functions involves many formulas, including the sine theorem and cosine theorem in triangles, so we need to spend a lot of time and energy to digest and absorb these formulas in order to achieve true integration. The angle analysis of trigonometric functions 1. The equivalent transformation of trigonometric functions When dealing with such problems, we have to memorize commonly used specific trigonometric functions (such as the double-width and half-width formulas, the productization and difference sum and difference product formulas). , but also for the appropriate analysis of specific topics, can not blindly substitute formulas, first of all to solve these problems have “return to ” thinking, that is, the complex triangle