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本节采用“问题─探究─抽象”的模式展开.首先在复习任意角三角函数定义的基础上,环环相扣、循序渐进地提出问题,然后学生自己探究出同角三角函数的基本关系式,再设置问题,进一步深化了对关系式的理解.最后通过多角度变式,让学生体验同角三角函数的基本关系式在一类三角求值方面的基本应用.一、教学目标1.知识与技能(1)通过任意角三角函数的定义导出同角三角函数关系式,并且熟记公式。(2)灵活使用公式解决:已知一个角的三角函数值,
Based on the review of the definitions of trigonometric functions of arbitrary angle, this section presents the problem step by step, and then the students explore the basic relationship of the same-angle trigonometric functions And then set the problem further deepen the understanding of the relationship.Finally, through the multi-angle variation, let the students experience the basic application of the basic relation of trigonometric trigonometric functions in a class of trigonometric evaluation.First, the teaching objectives 1. Knowledge and Skills (1) The definition of trigonometric functions derived from the same angle trigonometric function, and memorize the formula. (2) flexible use of formula to solve: known angle trigonometric function value,