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[" 9.If "A=sin^(2)x+cos^(4)x" ,then for ...

[" 9.If "A=sin^(2)x+cos^(4)x" ,then for all real "x:" - "],[[" (1) "1<=A<=2," (2) "(3)/(4)<=A<=(13)/(16)],[" (3) "(3)/(4)<=A<=1," (4) "(13)/(16)<=A<=1]]

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