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三角函数的图象是中学数学中重要的知识点,通过图象我们不但可以研究三角函数的性质,而且还可以快捷方便地解答三角函数有关问题.现举例说明如下:
The image of the trigonometric function is an important knowledge point in middle school mathematics. Through the image we can not only study the nature of the trigonometric function, but also can quickly and conveniently solve the problems related to the trigonometric function. The following examples are illustrated: