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

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

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