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三角函数性质的研究离不开三角恒等变换,三角恒等变换问题一般包括三角表达式的化简与求值、三角等式的证明,而解决这三类问题都需要化简,因此三角恒等变换就是三角表达式的化简.而三角表达式化简的基本方法就是消元.下面就以几例请同学们领悟消元方法在三角表达式化简中的作用.
The study on the nature of trigonometric functions can not be separated from the triangular equivalent transformation. The triangular equivalent transformation generally includes the simplification and evaluation of triangular expressions and the proof of triangular equations. However, solving these three kinds of problems needs to be simplified, Such transformation is the simplification of the triangular expression. The basic method of simplifying the triangular expression is elimination. Here are a few examples to ask students to understand the elimination method in the triangular expression of the role of simplification.