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What is the range of \(\cosec \theta\)?

Answer and explanation

Correct answer: \(( -\infty,-1]\cup[1,\infty)\)

\(\cosec\theta=\frac{1}{\sin\theta}\). Since \(-1\leq\sin\theta\leq1\) and \(\sin\theta\neq0\), the value of \(\cosec\theta\) is either less than or equal to \(-1\), or greater than or equal to 1. At \(\sin\theta=-1\) and \(1\), we get \(\cosec\theta=-1\) and \(1\), so both endpoints are included. Option C incorrectly excludes these endpoints. Exam tip: for reciprocal trigonometric functions, check values for which the denominator becomes zero.

Related tags

Trigonometric FunctionsRange Of CosecantReciprocal Trigonometric FunctionsClass 11 MathematicsRange And DomainTrigonometric Functions And Their PropertiesMathematicsClass 12 Mcq

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