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三角函数是高中数学中的一个重要知识点,它涉及大量的公式,对于一般的学生来讲,要充分掌握这些公式并在解题时灵活运用是比较困难的。基于此,本文从把握基础、灵活运用两个角度分析三角函数的复习策略。1把握基础例1已知α、β都是锐角,现在cosα的值为4/5,tan(α-β)的值为1/3,求cosβ的值。解题思路:本题的考查点主要是对三角函数各种定义的具体应用,这是常见的一种三角函数问题。对这类问题,正确的解题思路是扎实地掌握好正、余弦
Trigonometric function is an important knowledge point in high school mathematics, it involves a large number of formulas, for the average student, to fully grasp these formulas and flexible use of the problem-solving is more difficult. Based on this, this article analyzes the reviewing tactics of trigonometric functions from the perspective of grasping the foundation and using it flexibly. 1 Grasp Foundation Example 1 It is known that both α and β are acute angles, and the value of cosβ is now 4/5 and the value of tan (α-β) is 1/3. Problem-solving ideas: The test point of this question is mainly the specific application of various definitions of trigonometric functions, which is a common problem of trigonometric functions. On such issues, the correct solution to the problem is a solid grasp of positive, cosine