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What is the range of the function (2\cos x)?

Answer and explanation

Correct answer: \([-2,2]\)

Since \(\cos x\) lies between \(-1\) and \(1\), multiplying by 2 gives values of \(2\cos x\) from \(-2\) to \(2\). The endpoints are included because \(2\cos 0=2\) and \(2\cos \pi=-2\). Thus, \([-1,1]\) is the range of \(\cos x\), not of \(2\cos x\). Exam tip: the range of \(a\cos x\) is \([-|a|,|a|]\).

Related tags

Trigonometric FunctionsCosine RangeRange Of FunctionAmplitudeClass 11 MathematicsTrigonometric Functions And Their PropertiesMathematicsClass 12 Mcq

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