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

[" If "A=sin^(2)x+cos^(4)x" ,then for all real "x" : "],[[" (1) "(3)/(4)<=A<=1," (2) "(13)/(16)<=A<=1," (3) "1<=A<=2," (AIEEE "2011(4,-1),120]],[" (4) "(3)/(4)<=A<=(13)/(16)]]

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