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Which of the following intervals is the standard principal value range of \(\cot^{-1}x\)?

Answer and explanation

Correct answer: \((0,\pi)\)

The standard principal value range of \(\cot^{-1}x\) is \((0,\pi)\). On this open interval, \(\cot\theta\) gives each real value exactly once, so the inverse has a unique principal value. The interval \(\left(-\frac{\pi}{2},\frac{\pi}{2}\right)\) is the principal value range for \(\tan^{-1}x\), not for \(\cot^{-1}x\). Exam tip: Memorise the principal value ranges of inverse trigonometric functions separately.

Related tags

Inverse Trigonometric FunctionsPrincipal Value BranchCot InverseClass 12 MathematicsMathematicsClass 12 Mcq

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