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所谓三角条件恒等式的证明问题,是指除所学的公式之外另附加一些特殊的条件才能成立的同题。条件等式的证明是三角证明的一个重要的方面,这里我们介绍一些常见的类型和方法。一、代入法。这是指把已知式中的某一字母(或三角函数)用其它字母(或三角函
The proof of the so-called triangular conditional identities refers to the addition of some special conditions in addition to the learned formula. The proof of the conditional equation is an important aspect of the triangle proof. Here we introduce some common types and methods. First, substitute the law. This means using a letter (or trigonometric function) in the known formula with another letter (or triangular letter)