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A student states that the minimum value of \(y=2+\cos x\) is 0. What is the correct reason for the error in this argument?

Answer and explanation

Correct answer: The minimum value of \(\cos x\) is \(-1\), so the minimum value of \(y\) is \(1\).

The range of \(\cos x\) is \([-1,1]\). Adding 2 to both endpoints gives the range \([1,3]\), so the minimum is 1. In exams, when a constant is added, shift both endpoints of the range by that constant.

Related tags

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

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