ATS

1) The eqn (cos p -1) x2 + (cosp)x + sinp =0, in the variable x ,has real roots. Then p can have any value in the interval
(a) (0 , 2 pie)
(b) (- pie, 0 )
(c) (- pie/2 , pie/2 )
(d) ( 0 ,pie)

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