正割是三角函数的一种。在定义域为(0, π/2) 时是在直角三角形某个锐角的斜边与邻边的比，用sec表示。 正割是余弦的倒数，即secθ=1/cosθ，正割的函数图像为偶函数，且为周期函数.

Secant, cosecant and cotangent, almost always written as sec, cosec and cot are trigonometric functions like sin, cos and tan. sec x = 1 cos x. cosec x = 1 sin x cot x = 1 = cos x tan x sin x. …

Secant (sec) - Trigonometry function (See also Secant of a circle). In a right triangle, the secant of an angle is the length of the hypotenuse divided by the length of the adjacent side. In a …

其次是sec，它叫 正割. 类似地，cos和sec互为倒数，直角三角形里是斜边/邻边. 这里我多说一句，我建议大家学一下sec的读音，否则一说到它就叫s e c，这不方便叫. 来想一个场景. 老师 …

The secant function or sec function can be defined as the ratio of the length of the hypotenuse to that of the length of the base in a right-angled triangle. It is the reciprocal of cosine function …

Secant is denoted as 'sec'. Secant formula is derived out from the inverse cosine (cos) ratio. The secant function is the reciprocal of the cosine function, thus, the secant function goes to infinity …

secant, one of the six trigonometric functions, which, in a right triangle ABC, for an angle A, is sec A = length of hypotenuse / length of side adjacent angle A. (The other five trigonometric …

sec() function Secant is the ratio of the hypotenuse to the shorter side adjacent to an acute angle (in a right-angled triangle); the reciprocal of a cosine. This is an online free sec calculator.

The secant function \( sec (\theta) \) is defined as \( \sec(\theta) = \dfrac{r}{x} \) , where \( r \) is the distance from O to M and is given by \( r = \sqrt{x^2+y^2} \).

正割（Secant，sec）是三角函数的一种。 它的定义域不是整个实数集，值域是绝对值大于等于一的实数。 它是周期函数，其最小正周期为2π。