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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" : "],[[" (a) "(3)/(4)<=A<=1," (b) "(13)/(16)sin51," (c) "1<=A<=2," (d) "(3)/(4)sin(13)/(16)]]

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