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What is the minimum value of the function (5-2\cos x)?

Answer and explanation

Correct answer: 3

Since \(\cos x\) lies between \(-1\) and \(1\), \(5-2\cos x\) is smallest when \(\cos x=1\). Thus, its minimum value is \(5-2(1)=3\). The value \(7\) is the maximum, obtained when \(\cos x=-1\). Exam tip: For a trigonometric term with a negative coefficient, use the maximum value of that trigonometric function to find the minimum of the expression.

Related tags

Trigonometric FunctionsCosineRangeMinimum ValueClass 11 MathematicsTrigonometric Functions And Their PropertiesMathematicsClass 12 Mcq

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