Ohio Assessments for Educators (OAE) Mathematics Practice Exam 2026 - Free Practice Questions and Study Guide

The secant function is defined as the reciprocal of the cosine function. Therefore, when considering the options given, the correct representation of the secant function is indeed 1/cos(A). In trigonometric terms, if you have an angle A, the cosine of A relates to the adjacent side of a right triangle over the hypotenuse. The secant function, being the reciprocal, flips that relationship, giving you the hypotenuse over the adjacent side, or 1/cos(A).

The other choices represent different trigonometric functions or relationships. For instance, 1/sin(A) represents the cosecant function, while 1/tan(A) gives the cotangent function. The remaining option, tan(A)/sin(A), is not a standard definition in trigonometry. Hence, recognizing that sec(A) = 1/cos(A) is crucial for grasping its importance in trigonometric identities and calculations.