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[" If "sin^(6)theta+cos^(6)theta+k cos^(...

[" If "sin^(6)theta+cos^(6)theta+k cos^(2)2 theta=1" then "k" is equal to "],[[" (a) "(1)/(2)tan^(2)2 theta," (b) "(1)/(4)tan^(2)2 theta],[" (c) "4cot^(2)2 theta," (d) "(3)/(4)tan^(2)2 theta]]

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