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What is the value of \(\tan^{-1}1\)?

Answer and explanation

Correct answer: \(\frac{\pi}{4}\)

Reason: \(\tan\frac{\pi}{4}=1\), and the principal value of \(\tan^{-1}x\) lies in \((-\frac{\pi}{2},\frac{\pi}{2})\), so \(\tan^{-1}1=\frac{\pi}{4}\). Why other choices are wrong: \(0\) is wrong because \(\tan0=0\); \(\frac{\pi}{6}\) is wrong because \(\tan\frac{\pi}{6}=1/\sqrt{3}\), not 1; \(\frac{\pi}{2}\) is not valid as \(\tan\) is undefined there. Exam tip: Memorise standard tan values and remember arctan's principal range to pick the correct branch quickly.

Related tags

Inverse Trigonometric FunctionsValueArctanPrincipal ValueRadiansPrincipal Value BranchMathematicsClass 12 Mcq

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