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What is the correct form of \(\tan^{-1}(-x)\)?

Answer and explanation

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

The arctan function is odd and has principal value range \((-\tfrac{\pi}{2},\tfrac{\pi}{2})\). Hence for any real \(x\), \(\tan^{-1}(-x)= -\tan^{-1}x\). Option B is incorrect because it does not change the sign; options C and D do not generally equal \(\tan^{-1}(-x)\) within the principal range. Exam tip: check whether the inverse trig function is odd or even and remember its principal value interval.

Related tags

Inverse Trigonometric FunctionsOdd FunctionArctanTrig IdentitiesProperties Of Inverse Trigonometric FunctionsMathematicsClass 12 Mcq

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