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If sin alpha=-3/6, alpha in [0,2pi] then...

If `sin alpha=-3/6, alpha in [0,2pi]` then the possible values of `cos (alpha/2)`, is/are

A

(a)`1/sqrt(10)`

B

(b)`-1/sqrt(10)`

C

(c)`3/sqrt(10)`

D

(d)`-3/sqrt(10)`

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The correct Answer is:
B, D
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