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What is \(\sin^{-1}(-x)\) equal to for \(x\in[-1,1]\)?

Answer and explanation

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

The function \(\sin^{-1}x\) (arcsin) is odd, meaning \(\sin^{-1}(-x)=-\sin^{-1}x\) for all \(x\in[-1,1]\). Hence the correct choice is \(-\sin^{-1}x\). Option B is incorrect because that would require the function to be even. Options C and D are related identities (\(\cos^{-1}x=\tfrac{\pi}{2}-\sin^{-1}x\)) but do not equal \(\sin^{-1}(-x)\). Exam tip: check odd/even properties of inverse trig functions first — they often give the quickest justification.

Related tags

Inverse Trigonometric FunctionsArcsinOdd FunctionTrigonometric IdentitiesProperties Of Inverse Trigonometric FunctionsMathematicsClass 12 Mcq

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