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What is the domain of \(\tan^{-1}(x^2+1)\)?

Answer and explanation

Correct answer: (\mathbb{R})

The governing domain fact is that tan⁻¹u, or arctan u, is defined for every real number u. The tangent function itself has restrictions, but its inverse has real domain all of ℝ. Since x² + 1 is real for every real x, substituting u = x² + 1 creates no additional restriction on x. Although x² + 1 is always at least 1, that describes the range of the inner expression, not the domain of the complete composite function. Therefore the domain is ℝ and option A is correct. Options B, C, and D impose restrictions that are not required for arctan; in particular, [1, ∞) is only the set of possible inner values.

Related tags

Inverse-TrigonometryDomainArctanDomain And RangeInverse Trigonometric FunctionsMathematicsClass 12 Mcq

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