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高中数学必修4三角函数一章中,任意角的三角函数定义是通过单位圆给出的。事实上,三角函数刻画了单位圆上的点的变化规律。可以看出,单位圆与三角函数联系紧密。聚焦单位圆,能深入理解三角函数定义,能帮助理解、记忆三角函数的有关公式、性质;聚焦单位圆,能作出三角函数的图象,能简化三角的证明,能快速地求出三角不等式的解集。
High school math compulsory 4 Triangular function chapter, any angle of the trigonometric function definition is given by the unit circle. In fact, trigonometric functions characterize the variation of points on a unit circle. It can be seen that the unit circle and the trigonometric function are closely related. Focusing on the unit circle can deeply understand the definition of trigonometric functions and help to understand and memorize the related formulas and properties of trigonometric functions. Focusing on the unit circle can make trigonometric functions, simplifying the proof of trigonometry and quickly finding trigonometric inequalities Set solution.