JEE Math Practice Question
Let f(x) = sin4x + cos4 x. Then f is an increasing function in the interval :
- A.$$] 0, \frac{\pi}{4}[$$
- B.$$] \frac{\pi}{4}, \frac{\pi}{2}[$$
- C.$$] \frac{\pi}{2}, \frac{5 \pi}{8}[$$
- D.$$] \frac{5 \pi}{8}, \frac{3 \pi}{4}[$$
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