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The equation (cosp - 1) x^2 +cosp x + si...

The equation `(cosp - 1) x^2 +cosp x + sinp = 0` where x is a variable, has real roots. then the interval of p may be any one of the following :

A

`(0, 2 pi)`

B

`(-pi, 0)`

C

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

D

`(0, pi)`

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The correct Answer is:
D
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