Pronunciation: English [sa? [N], beauty [sa? n]？

Sine, a mathematical term, in a right triangle, the ratio of the opposite side to the hypotenuse of any acute angle ∠A is called sine of ∠A, which is abbreviated from the English word sine, that is, the opposite side/hypotenuse of Sina = ∠ A.

2、cos

Pronunciation: English [? ksa？ N], beauty [? ko？ Sa? n]？

Cosine, a trigonometric function. In Rt△ABC (right triangle), ∠ c = 90 (as shown in the figure), and the cosine of ∠A is the hypotenuse of the adjacent side of the triangle, that is, cosA=b/c, which can also be written as cosa=AC/AB. Cosine function: f(x)=cosx(x∈R).

3. Tan

Pronunciation: English [? t？ Ndnt], beauty [? t？ ndnt]？

Tangent, in Rt△ABC (right triangle), ∠C = 90, AB is the opposite side C of ∠ C, BC is the opposite side A of ∠A, AC is the opposite side B of ∠B, and the tangent function is tanB=b/a, that is, tanB=AC/BC.

4. crib

Pronunciation: English [k? T], beauty [k? t]？

Cot is the symbol of cotangent trigonometric function in trigonometric function, which was previously written as ctg. Cot coordinate system indicates: cotθ=x/y, cotθ=cosθ/sinθ in trigonometric function, and cotθ= 1/tanθ when θ=kπ, k∈Z (cotθ does not exist when θ = kπ, k∈Z). The adjacent side of angle a is the opposite side of angle a.

5, seconds

Pronunciation: English [sek], American [sek]?

Secant refers to the ratio of the hypotenuse of a right triangle to the adjacent side of an acute angle. The ratio of the hypotenuse of a right triangle to the adjacent side of an acute angle is called the secant of the acute angle, which is expressed in seconds (angles).

6、csc

Pronunciation: English? 【k'si？ k？ nt； -"sek-], beauty? [Xihe? k？ nt]

Cotangent is the ratio of the hypotenuse to the opposite side of an acute angle in a right triangle, which is expressed by csc (cotangent).

The hypotenuse of an angle is higher than the opposite side, the vertex of this angle coincides with the origin of the plane rectangular coordinate system, and its starting edge coincides with the positive direction of the X axis. Write cscx. Its ratio to sine is reciprocal. The function of cotangent is like odd function, which is a periodic function.