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三角学, 三角学分支
a branch of mathematics that deals with the relationships between the angles and sides of triangles
- 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。
- The Pythagorean identity, a fundamental relation in trigonometry, states that sin²θ + cos²θ = 1.
毕达哥拉斯恒等式，三角学中的一个基本关系，指出sin²θ + cos²θ = 1。
- In navigation, trigonometry is crucial for calculating distances and angles, especially in celestial navigation using stars and planets.
在导航中，三角学对于计算距离和角度至关重要，尤其是在使用恒星和行星进行的天体导航中。
- Trigonometry plays a key role in fields such as physics, engineering, and computer science, where understanding angles and periodic functions is essential.
三角学在物理学、工程和计算机科学等领域起着关键作用，其中理解角度和周期函数是必不可少的。