Let f (θ) = sin θ (sin θ + sin 3θ) then f
Mathematics · JEE Advanced · NTA Exams — Trigonometry
Let f (θ) = sin θ (sin θ + sin 3θ) then f
- ≥ 0 only when θ ≥ 0
- ≤ 0 for all real θ
- ≥ 0 for all real θ
- ≤ 0 only when θ ≤ 0 .
Answer
(C) ≥ 0 for all real θ
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