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If \(y=\tan^{-1}x\), which of the following is true?

Answer and explanation

Correct answer: \(\tan y = x\)

By definition, \(y=\tan^{-1}x\) means y is the angle whose tangent equals x; hence \(\tan y = x\). The other choices (\(\sin y = x\), \(\cos y = x\), \(\sec y = x\)) are not generally true for the angle given by \(\tan^{-1}x\) except in special cases, so they are not correct in general. Exam tip: Memorize the definitions and principal value ranges of inverse trig functions (e.g. \(-\pi/2<y<\pi/2\) for \(\tan^{-1}x\)).

Related tags

Inverse Trigonometric FunctionsArctanDefinitionTrigonometryIntroduction To Inverse Trigonometric FunctionsMathematicsClass 12 Mcq

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