trigonocephalus

例句：

1. 1.The trigonometric functions are used inphysics to calculate the length ofa line.
   在物理学中，正弦、余弦和正切函数用于计算线的长度。
2. 2. The trigonometric functions arealso used in engineering to determine the anglebetween two points.
   正弦、余弦和正切函数还在工程学中被用来确定两点之间的夹角。
3. 3. In ancienttimes, trigonometric functions were usedto navigate by stars and planets.
   在古代，正弦、余弦和正切函数被用来通过星星和行星导航。