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Which of the following inverse trigonometric functions has the principal-value range \([0,\pi]\)?

Answer and explanation

Correct answer: \(\cos^{-1}x\)

The principal-value range of \(\cos^{-1}x\) is \([0,\pi]\), where \(x\in[-1,1]\). Hence, option B is correct. The closest distractor, \(\sin^{-1}x\), has principal-value range \(\left[-\frac{\pi}{2},\frac{\pi}{2}\right]\), so it is not correct. Exam tip: Memorise the principal-value ranges of inverse trigonometric functions separately.

Related tags

Inverse Trigonometric FunctionsPrincipal Value RangeArccosClass 12 MathematicsTrigonometryPrincipal Value BranchMathematicsClass 12 Mcq

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