The function f ( x ) = sin 4 x + cos 4 x increases if
Mathematics · JEE Advanced · NTA Exams — Limit, Continuity and Differentiability
The function f (x) = sin4x + cos4x increases if
- \(0
- \(\frac{\pi}{4}
- \(\frac{3 \pi}{8}
- \(\frac{5 \pi}{8}
- \(\frac{\pi}{4}
Answer
(B) 4 <x< 3 8
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