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What is the domain of tan⁻¹x?

Answer and explanation

Correct answer: ℝ

The inverse tangent function tan⁻¹x is defined as the inverse of tangent after restricting tangent to its principal interval (−π/2, π/2). On that interval, tan y is continuous, strictly increasing, and takes every real value from −∞ to +∞. Therefore every real number x has exactly one principal angle y such that tan y = x. The input set, or domain, of tan⁻¹x is consequently all real numbers, ℝ. Option C is correct. The interval [−1, 1] is the domain of inverse sine and inverse cosine, not inverse tangent. The interval [0, π] is associated with the principal range of inverse cosine, while option D describes neither the domain nor the range of tan⁻¹x.

Related tags

Inverse-Trigonometric-FunctionsDomainArctangentDomain And RangeInverse Trigonometric FunctionsMathematicsClass 12 Mcq

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