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What is the range of (f(x)=2+\sin x)?

Answer and explanation

Correct answer: ( [1,3] )

The direct answer is option A: the range is [1,3]. Start with the basic fact -1\le\sin x\le1 for every real x. Adding 2 throughout gives 1\le2+\sin x\le3. Thus f(x) can never be below 1 or above 3, and both endpoints occur: sin x=-1 gives f(x)=1, while sin x=1 gives f(x)=3. Option A is correct. Option B is only the range of sin x and forgets the added 2. Option C misses the value 1 and is too narrow. Option D claims every real value is possible, but sine is bounded. Exam cue: adding a number shifts both ends of a range by that number.

Related tags

Real-Valued-FunctionsRangeTrigonometryShift

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