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Which of the following trigonometric functions has domain \(x\ne \frac{(2n+1)\pi}{2}\), where \(n\in\mathbb{Z}\), and range \(( -\infty,-1]\cup[1,\infty)\)?

Answer and explanation

Correct answer: \(\sec x\)

Since \(\sec x=1/\cos x\), it is undefined when \(\cos x=0\), i.e. at \(x=\frac{(2n+1)\pi}{2}\). Also, \(|\sec x|\ge1\), giving the stated range. For \(\csc x\), the excluded values are \(n\pi\). Exam tip: first locate angles that make the denominator zero in reciprocal functions.

Related tags

Trigonometric FunctionsSecant FunctionDomain And RangeReciprocal IdentitiesClass 11 MathematicsTrigonometric Functions And Their PropertiesMathematicsClass 12 Mcq

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