Trigonometry
01
三角学, 三角学分支
a branch of mathematics that deals with the relationships between the angles and sides of triangles
例子
In trigonometry, the sine function ( sin ) relates the ratio of the length of the opposite side to the hypotenuse in a right-angled triangle.
在三角学中，正弦函数（sin）关联直角三角形中对边长度与斜边的比率。
The cosine function ( cos ) in trigonometry expresses the ratio of the adjacent side to the hypotenuse.
三角函数中的余弦函数（cos）表示邻边与斜边的比率。
