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[" Let "f(x)=sin^(4)x+cos^(4)x" .Then "f...

[" Let "f(x)=sin^(4)x+cos^(4)x" .Then "f" is an increasing function in the "],[" interval: "],[qquad [" A."O(0,(pi)/(4))],[" B."((pi)/(2),(5 pi)/(8))],[" D.O "((5 pi)/(8),(3 pi)/(4))]]

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