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: Cosecant Function: csc (θ) = Hypotenuse / Opposite. Secant Function: sec (θ) = Hypotenuse / Adjacent.

正割 （Secant， ）是 三角函数 的一种。 它的 定义域 是不含 （或 180°k+90°，其中 為整數）的整个 实数集， 值域 是 絕對值 大於等于 一 的 实数。 它是 周期函数，其最小正 周期 为 （360°）。 正割 是 三角函数 的正函數（正弦 、 正切 、 正割 、 正矢）之一，所以在 （360°k）到 （360°k+90°）的區間之間，函數是 遞增 的，另外 正割 函数和 餘弦 函数互為 倒數。 在 單位圓 上，正割函数位於 割線 上，因此將此函數命名為正割函数。 和其他 三角函數 一 …

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 [1]. 正割的数学符号为sec出自英文secant。 该符号最早由数学家吉拉德·笛沙格在他的著作《三角学》中所用 …

All the trigonometric identities are based on the six trigonometric ratios. They are sine, cosine, tangent, cosecant, secant, and cotangent. All these trigonometric ratios are defined using the sides of the right triangle, such as an adjacent side, opposite side, and hypotenuse side.

Basic trig identities are formulas for angle sums, differences, products, and quotients; and they let you find exact values for trig expressions.

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 formula, it is abbreviated to just 'sec'. Of the six possible trigonometric functions, secant, cotangent, and cosecant, are rarely used. In fact, most ...

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 functions are sine [sin], cosine [cos], tangent [tan], cosecant [csc], and cotangent [cot].)

Secant is one of the ratios that is derived from the cosine ratio. The secant formula helps in finding out the hypotenuse, the length, and the adjacent side of a right-angled triangle . The formula is sec ⁡θ = H/B

The three theorems for the intercepted arcs to the angle of two tangents, two secants or 1 tangent and 1 secant are summarized by the pictures below. If you look at each theorem, you really only need to remember ONE formula.

2025年3月7日 · The secant function, \sec \theta , is defined as the reciprocal of the cosine function. Let’s explore some key characteristics: Domain: The secant function is undefined where cosine equals zero. Therefore, its domain excludes angles like 90^\circ and 270^\circ . Range of Secant Function: Secant values can range from (-\infty, -1] \cup [1 ...