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[" 40.The range of "k" for which the ine...

[" 40.The range of "k" for which the inequality "k cos^(2)x-k cos x+1>=0AA x in(-oo,oo)" is: "],[[" (a) "k>-(1)/(2)," (b) "k>4," (c) "-(1)/(2)<=k<=4," (d) "(1)/(2)<=k<=5]]

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