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Find the value of \(\sin^{-1}\left(\frac{\sqrt{2}}{2}\right)-\cos^{-1}\left(\frac{\sqrt{2}}{2}\right)\).

Answer and explanation

Correct answer: 0

The principal value range of \(\sin^{-1}x\) is \([-\tfrac{\pi}{2},\tfrac{\pi}{2}])\) and for \(\cos^{-1}x\) it is \([0,\pi]\). Since \(\sin\tfrac{\pi}{4}=\cos\tfrac{\pi}{4}=\tfrac{\sqrt{2}}{2}\), both inverse values equal \(\tfrac{\pi}{4}\). Therefore the difference is \(\tfrac{\pi}{4}-\tfrac{\pi}{4}=0\). The nearest distractor \(\tfrac{\pi}{4}\) is the value of each inverse separately, not their difference. Exam tip: always check the principal value intervals for inverse trig functions before subtracting.

Related tags

Inverse-Trigonometric-FunctionsSpecial-ValuesPrincipal-ValuesTrigonometryPrincipal Value BranchInverse Trigonometric FunctionsMathematicsClass 12 Mcq

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