Teaching NVS PGT 2024 Test Series Mathematics Differential Calculus Applications of Derivatives

ফাংশন f(x) = sin4 x + cos4 x কোন ক্ষেত্রে একভাবে বেড়ে যায়?

1
\(0 < x < \frac{\pi }{8}\)
2
\(\frac{\pi }{4} < x < \frac{{\pi }}{2}\)
3
\(\frac{{3\pi }}{4} < x < \frac{{5\pi }}{8}\)
4
\(\frac{{5\pi }}{8} < x < \frac{{3\pi }}{4}\)
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