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If the equation (cos p - 1)x^(2) + cos p...

If the equation `(cos p - 1)x^(2) + cos p x + sin p =0` in the varable x has real roots then p can taken any value in the interval

A

`(0,2pi)`

B

` (-pi,0)`

C

` (-pi //2 , pi //2)`

D

`(0,pi)`

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The correct Answer is:
D
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