Mathematics · Calculus
The function f(x) = sin4x + cos4x is strictly increasing in the interval:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 15π8 < x < 3π4
- 23π8 < x < 5π8
- 3π4 < x < π2✓
- 40 < x < π8
Correct answer
π4 < x < π2
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