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What is the minimum value of the function (-3\cos x)?

Answer and explanation

Correct answer: \(-3\)

Since \(\cos x\) lies between \(-1\) and \(1\), \(-3\cos x\) lies between \(-3\) and \(3\). When \(\cos x=1\), we get \(-3\cos x=-3\); hence the minimum value is \(-3\). The value \(3\) is the maximum, obtained when \(\cos x=-1\). Exam tip: multiplying a trigonometric function by a negative number reverses the order of its maximum and minimum values.

Related tags

Trigonometric FunctionsCosineRange Of CosineMinimum ValueClass 11 MathematicsTrigonometric Functions And Their PropertiesMathematicsClass 12 Mcq

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