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

Answer and explanation

Correct answer: \(( -\infty,\infty )\)

\(\tan\theta=\dfrac{\sin\theta}{\cos\theta}\). For values of \(\theta\) where \(\cos\theta\ne0\), \(\tan\theta\) can take every real value. Hence its range is \(( -\infty,\infty )\). The interval \([-1,1]\) is the range of \(\sin\theta\) and \(\cos\theta\), not \(\tan\theta\). Exam tip: the range of \(\tan\theta\) is all real numbers, although it is undefined at \(\theta=\frac{\pi}{2}+n\pi\).

Related tags

Trigonometric FunctionsRange Of TangentTangent FunctionClass 11 MathematicsReal NumbersTrigonometric Functions And Their PropertiesMathematicsClass 12 Mcq

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