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[" 6.Given "A=sin^(2)theta+cos^(4)theta,...

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

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