JEE Mathematics · Hard

Trigonometry: Range MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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RangeHardQuestion 200048

Question

The range of f(x) = 2 sin x + 3 cos x is:
  1. A
    [−√13, √13]
    Correct
  2. B
    [−5, 5]
  3. C
    [−2, 3]
  4. D
    [−3, 3]

Correct answer

[−√13, √13]

Explanation

a sin x + b cos x has range [−√(a²+b²), √(a²+b²)]. Here: √(4+9) = √13. Range = [−√13, √13].