College Math CLEP Prep Practice Exam

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What trigonometric function of an angle contains the angle in radians?

Sine
Cosine
Tangent
Cotangent

The correct answer is: Cosine

Cosine is the only trigonometric function that contains the angle in radians. Sine and tangent relate the ratio of sides of a right triangle, and cotangent is the inverse of tangent. While cosine can also be used to find the ratio of sides, it is unique in that it can also take in the angle itself in radians to find the ratio. Therefore, cosine is the only correct answer.