Secx is secant, which is a kind of trigonometric function. Its definition domain is not a whole set of real numbers, and its value domain is a real number whose absolute value is greater than or equal to 1 It is a periodic function with a minimum positive period of 2π.

Secant refers to a right-angled triangle, and the ratio of the hypotenuse of an acute angle to the adjacent side is called secant of an acute angle, which is expressed by sec (angle). Secant is the reciprocal of cosine function.

Secant attribute:

Y = y = the attribute of secx.

(1) domain, {x | x ≠ kπ+π/2, k∈Z}.

(2) Range, | secx | ≥ 1. That is secx≥ 1 or secx ≤- 1.

(3)y=secx is an even function, that is, sec (-x) = secx. The image is symmetrical with respect to the y axis.

(4)y=secx is a periodic function. The period is 2kπ(k∈Z, k≠0), and the minimum positive period T=2π.