Sine, Cosine and Tangent (often shortened to sin, cos and tan) are each a ratio of sides of a right angled triangle: For a given angle θ each ratio stays the same no matter how big or small the triangle is

正切的符号为 ，源于英文tangent。 该符号最早由 数学家 湯瑪斯·芬克 （英语：Thomas Fincke） （Thomas Fincke）所采用。 在 直角三角形 中，一个锐角的 正切 定义为它的對邊与鄰邊的比值，也就是： {\displaystyle \tan \theta = {\frac {\text {a}} {\text {b}}}= {\frac {\sin \theta } {\cos \theta }}\,\!} 可以發現其定義和 餘切函數 互為 倒數。 设 是平面 直角坐标系 xOy中的一个 象限角， 是角的终边上一点， 是P到原点O的距离，则 的正切定义为： 图像中给出了用 弧度 度量的某个公 …

正弦 （sine）, 余弦 （cosine） 和 正切 （tangent） （英语符号简写为 sin, cos 和 tan) 是 直角三角形 边长的比： 计算方法： 用一条边的长度除以另一条边的长度. 例子： 35°的正弦是多少？ = 0.57... = 0.82…… = 0.70…… 好的计算器都会有 sin, cos 和 tan 的键，方便计算。 你只需输入角度然后按键。 可是你还是要记得它们的意思！ 用图来显示： Well Done! 怎样去记住？ 想想，用这个怪怪的英文单词 "Sohcahtoa"！ Soh... ...cah... 去这页 sohcahtoa 了解更多。 记住它，考试时 …

Analysis of PDEs coming from fluid dynamics and magnetohydrodynamics. With C. Prange, Free boundary regularity of vacuum states for incompressible viscous flows in unbounded domains, arXiv:2310.09288v3 (2023), 45 pages, submitted.

Cosine Function: cos (θ) = Adjacent / Hypotenuse. Tangent Function: tan (θ) = Opposite / Adjacent. When we divide Sine by Cosine we get: So we can say: That is our first Trigonometric Identity. We can also divide "the other way around" (such as Adjacent/Opposite instead of Opposite/Adjacent) to get:

Whether we need to calculate the sine, cosine, tangent values, or just solve complex trigonometric identities, a trigonometry calculator can provide quick and very precise answers. The trigonometry calculator removes the need for manual calculations, reducing errors and saving time.

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Tangent, written as tan⁡ (θ), is one of the six fundamental trigonometric functions. Tangent, like other trigonometric functions, is typically defined in terms of right triangles and in terms of the unit circle.

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