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“三角函数”这章分以下三个单元学习: 1.0°到360°的角的三角函数, 2.任意角的三角函数, 3.三角函数的图象和性质。很明显,任意角的三角函数,包括了0°到360°的角的三角函数。这里为了学习上的方便,多来一次循环。我们的想法是,即使初中没学过锐角三角函数,这样学起来也不会感到困难。初中锐角三角函数中的一些基本关系式和一些特殊角(0°、30°、45°、60、90°)的三角函数值,在这一章中都讲到了。因此,
The “trigonometric function” chapter is divided into the following three units: Trigonometric functions for angles from 1.0° to 360°, 2. Trigonometric functions for arbitrary angles, 3. Images and properties of trigonometric functions. Obviously, any corner trigonometric function includes a trigonometric function of an angle of 0° to 360°. Here for learning convenience, one more cycle. Our idea is that even if junior high school did not learn the acute angle trigonometry, it would not be difficult to learn. Some basic relations in the trigonometric function of junior high school and some trigonometric values of special angles (0°, 30°, 45°, 60, 90°) are described in this chapter. therefore,