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[" 21.The function "f:R rarr R" is defin...

[" 21.The function "f:R rarr R" is defined by "f(x)=cos^(2)x+sin^(4)x" .Then,"f(R)=],[[" (a) "[3/4,1)," (b) "(3/4,1]," (c) "[3/4,1]," (d) "(3/4,1)],[" (b) "]]

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