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What is the range of cot θ?

Answer and explanation

Correct answer: (−∞, ∞)

The range is the complete set of output values produced by the function over its domain. Since cot θ = cos θ/sin θ, it is undefined when sin θ = 0, but it can produce every real number. To see this, let cot θ = r for any real r. The equation cos θ = r sin θ has solutions because a suitable angle can be chosen with the required ratio of cosine to sine; for example, cot(π/4) = 1, cot(3π/4) = −1, and angles near 0 produce arbitrarily large positive or negative values. Therefore the range is all real numbers, (−∞, ∞), making option A correct. The interval [−1, 1] belongs to sine and cosine, while the other options exclude many attainable negative or large values.

Related tags

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

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