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In which interval does the principal value of \(\tan^{-1}x\) lie?

Answer and explanation

Correct answer: \(\left(-\frac{\pi}{2},\frac{\pi}{2}\right)\)

The principal value of \(\tan^{-1}x\) lies in \(\left(-\frac{\pi}{2},\frac{\pi}{2}\right)\). The endpoints \(\pm\frac{\pi}{2}\) are excluded because tangent is undefined there. Option C is close, but it incorrectly includes these endpoints. Exam tip: Remember that the principal-value intervals for \(\tan^{-1}x\) and \(\cot^{-1}x\) are different.

Related tags

Inverse Trigonometric FunctionsPrincipal ValueArctangentRangeClass 12 MathematicsProperties Of Inverse Trigonometric FunctionsMathematicsClass 12 Mcq

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