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What is the value of \(\tan^{-1}\left(\tan\left(-\frac{\pi}{3}\right)\right)\)?

Answer and explanation

Correct answer: \(-\frac{\pi}{3}\)

The principal value of \(\tan^{-1}x\) lies in \((-\tfrac{\pi}{2},\tfrac{\pi}{2})\). The angle \(-\tfrac{\pi}{3}\) is inside this interval and \(\tan(-\tfrac{\pi}{3})=-\sqrt{3}\). Therefore \(\tan^{-1}(\tan(-\tfrac{\pi}{3}))=\tan^{-1}(-\sqrt{3})=-\tfrac{\pi}{3}\). Option B has the wrong sign; options C and D correspond to angles outside the principal range. Exam tip: always check whether the original angle lies in the principal branch of the inverse trig function before simplifying.

Related tags

Inverse Trigonometric FunctionsArctanPrincipal ValueTrigonometryCompositionPrincipal Value BranchMathematicsClass 12 Mcq

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