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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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