Let (sin a) x^(2) + (sin a) x + 1 - cos ...

Let `(sin a) x^(2) + (sin a) x + 1 - cos a = 0`. The set of values of a for which roots of this equation are real and distinct, is

A

`(0,2 tan^(-1)1//4)`

B

`(0,2pi//3)`

C

`(0,pi )`

D

`(0,2 pi)`

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The correct Answer is:

A

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