What is 1 cosx?

1 cosx is an expression that represents the reciprocal of the cosine function. It is denoted as sec(x) and is defined as the ratio of the hypotenuse to the adjacent side in a right triangle, where x is one of the angles. The value of sec(x) is undefined for x = (2n + 1)π/2, where n is an integer, because in those cases the cosine of x is equal to zero, and the denominator becomes zero in the expression. The function sec(x) is periodic with a period of 2π, and its range is the set of all real numbers excluding the interval [-1, 1]. It has several important applications in trigonometry, calculus, and physics, such as in calculating tangents, derivatives, and gravitational forces.