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What is the value of tan⁻¹(tan(π/6))?

Answer and explanation

Correct answer: π/6

The principal-value rule for inverse tangent is essential: tan⁻¹(tan θ) equals θ only when θ lies in the principal range (−π/2, π/2). The angle π/6 lies inside this interval. Since tan(π/6) = 1/√3, applying the principal inverse tangent gives tan⁻¹(1/√3) = π/6. Therefore option A is correct. Although 5π/6 has the same tangent as π/6 because tangent is periodic, it is outside the principal range and cannot be returned by tan⁻¹. Option C has the opposite sign, while tan(π/3) = √3, not 1/√3, so option D is also incorrect. The inverse function is not unrestricted cancellation; its principal range must always be checked.

Related tags

Inverse Trigonometric FunctionsPrincipal ValueArctangentTrigonometryClass 12Principal Value BranchMathematicsClass 12 Mcq

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