The function \( f(x)=\sin ^{4} x+\cos ^{4} x \) increases if -
(a) \( 0x\frac{\pi}{8} \)
(d) \( ...
The function \( f(x)=\sin ^{4} x+\cos ^{4} x \) increases if -
(a) \( 0x\frac{\pi}{8} \)
(d) \( \frac{\pi}{4}x\frac{3 \pi}{8} \)
(c) \( \frac{3 \pi}{8}x\frac{5 \pi}{8} \)
(d) \( \frac{5 \pi}{8}x\frac{3 \pi}{4} \)
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