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[" 2.11The range of "k" for which the in...

[" 2.11The range of "k" for which the inequality "k cos^(2)x-k cos x+1>=0,AA 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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