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[" The equation "(cos p-1)x^(2)+(cos p)x+sin p=0],[" has real roots in "x" ',then set of values of 'p' lisi- "],[[" (1) "[0,2 pi]," (2) "|-pi,0]],[" (3) "[-pi/2*pi/2]," (4) "[0,pi]]]

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