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If \(\tan^{-1}x = 0\), what is the value of x?

Answer and explanation

Correct answer: \(0\)

\(\tan^{-1}x\) denotes the angle whose tangent is x. If \(\tan^{-1}x=0\), taking tan of both sides gives \(x=\tan0=0\). Also note arctan's principal value lies in \((-\tfrac{\pi}{2},\tfrac{\pi}{2})\), so the solution is unique. Option B (1) would be correct only if \(\tan^{-1}x=\tfrac{\pi}{4}\). Option D is an angle (\(\tfrac{\pi}{4}\)), not the value of x. Exam tip: clearly distinguish the inverse-trig function's output (an angle) from the variable x before applying the direct trig function.

Related tags

Inverse-TrigonometryEquationsArctanPrincipal-ValueProperties Of Inverse Trigonometric FunctionsInverse Trigonometric FunctionsMathematicsClass 12 Mcq

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