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What is the range of the function cos x?

Answer and explanation

Correct answer: [-1, 1]

The range of a function is the set of all output values it can take. On the unit circle, cos x represents the horizontal coordinate, whose value can never be less than −1 or greater than 1. Equivalently, the basic cosine graph reaches a maximum of 1 and a minimum of −1, and both values occur, for example cos 0 = 1 and cos π = −1. Hence the range is the closed interval [−1, 1], so option B is correct. Option A excludes negative cosine values, option C is far too broad, and option D excludes all values below 1. The brackets show that the endpoints are included.

Related tags

Trigonometric-FunctionsRangeCosineTrigonometric Functions And Their PropertiesTrigonometric FunctionsMathematicsClass 12 Mcq

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