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解答三角函数题,几乎都要通过恒等变换将复杂问题简单化,将隐性问题明朗化。三角恒等变换的公式很多,主要有“同角三角函数的基本关系”、“诱导公式”、“和、差、倍、半角公式”等,这些公式间一般都存在三种差异,如角的差异、函数名的差异和运算种类的差异,只有灵活地使用这些公式,消除差异、化异为同,才能得心应手,这是三
To solve the problem of trigonometric functions, it is necessary to simplify complicated problems by almost equal transformation and clarify the hidden problems. There are many formulas for the transformation of the trigonometric identities, mainly including the basic relations of trigonometric trigonometric functions, the induction formulas, the difference, the doubling, the half-angle formulas, etc. These formulas generally have three Differences in species, such as differences in angles, differences in function names, and differences in types of operations, are only meticulously using these formulas, eliminating variances,