JEE Advance - Mathematics (1999 - No. 38)

The function $$f(x)=$$ $${\sin ^4}x + {\cos ^4}x$$ increases if

$$0 < x < \pi /8$$

$$\pi /4 < x < 3\pi /8$$

$$3\pi /8 < x < 5\pi /8$$

$$5\pi /8 < x < 3\pi /4$$

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