In mathematics, the trigonometric functions(also called circular functions, angle functions or goniometric functions are functions of an angle.
- the trigonometric functions: 三角函数
- circular functions: 圆函数
- goniometric functions: 测角函数
- function of an angle: 角函数
They relate the angles of a triangle to the lengths of its sides.
重点句型:
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relate A to B: 数学中常用句型，relate为动词，表示 A与B相关 或 A涉及B 或 将A与B联系起来...
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They指代三角函数
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整句连起来就是:三角函数把三角形的角与它的边的长度联系起来(语文不太好，翻译的比较生硬)
Trigonometric functions are important in the study of triangles and modeling periodic phenomena, among many other applications.
- be important in... 在...方面很重要
- in the study of trangles: 在三角形的学习方面(be important in)
- in modeling periodic phenomena: 在周期现象建模方面
- and 连词连接的是in后面的内容，介词in表示在...方面。而model做动词，但是前面是介词，所以必须要动名词形式，因此加ing。
The cosine of an angle is the ratio of the length of the adjacent side to the length of the hypotenuse。
- ratio of sth to sth：昨天的sine中详细讲解了
- the adjacent side: 相邻的边(邻边)
- the hypotenuse: （直角三角形的） 斜边
- 再加一个单词活就齐了: the opposite side 对边
cosine.png
sine.png
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