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Let (sin a) x^(2)+(sin a) x+(1-cos a)=0 ...

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

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

B

2: `(0, (2 pi)/(3))`

C

3: `(0, pi)`

D

4: `(0,2 pi)`

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A
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