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What is the range of the function (3\sin 2x-1)?

Answer and explanation

Correct answer: \([-4,2]\)

Since \(\sin 2x\) always lies between \(-1\) and \(1\), the range of \(3\sin 2x\) is \([-3,3]\). Adding \(-1\) shifts every value down by 1, giving \([-3-1,\,3-1]=[-4,2]\). Hence, option B is correct. Option A accounts only for multiplication by 3 and misses the downward shift by 1. Exam tip: the range of \(a\sin(bx)+c\) is \([c-|a|,\,c+|a|]\).

Related tags

Trigonometric FunctionsRange Of SineFunction TransformationsClass 11 MathematicsTrigonometric Functions And Their PropertiesMathematicsClass 12 Mcq

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