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[" 9.The equation "(cos p-1)x^(2)+(cos p...

[" 9.The equation "(cos p-1)x^(2)+(cos p)x+(sin p)=0" in the variable "x" has real roots.Then "p" can take "],[" any value in the interval "],[[" (A) "(0,2 pi)," (B) "(-pi,0)," (C) "(-(pi)/(2),(pi)/(2))," (D) "(0,pi)]]

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