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同角三角函数的基本关系式有sin2α+cos2α=1,tan α=sinα/cosα.利用它可以求值、化简和证明,要求学生牢固掌握,并能运用每个关系式及变形式灵活解题.下面就利用同角三角函数的基本关系式进行解题介绍几种方法.
The basic relationship of the same trigonometric trigonometric function is sin2α + cos2α = 1, tan α = sinα / cosα. It can be used to evaluate, simplify and prove. It requires students to grasp firmly and flexibly use each relation and variation The following questions on the use of the same triangular trigonometric function to solve the problem of several ways to introduce.