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Which is the range of cos θ?

Answer and explanation

Correct answer: [−1, 1]

The range of a function is the set of output values it can attain. On the unit circle, cos θ is the x-coordinate of a point, and every x-coordinate lies between −1 and 1 inclusive. The endpoint values occur at θ = π, where cos θ = −1, and θ = 0 or 2π, where cos θ = 1. All intermediate values are also attained as the point moves around the circle. Hence the range is [−1, 1], so option A is correct. The other intervals incorrectly restrict cosine to nonnegative values, values at least 1, or values no greater than −1. Cosine and sine both have the same range, although their values occur at different angles.

Related tags

Trigonometric-FunctionsRangeCosineDomainAnd Graphs Of Trigonometric FunctionsDomain Range And Graphs Of Trigonometric FunctionsTrigonometric FunctionsMathematicsClass 12 Mcq

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