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If alpha in [pi/2,pi], then the value of...

If `alpha in [pi/2,pi]`, then the value of `sqrt(1+sin alpha)- sqrt(1-sinalpha)` is equal to:

A

`2 "cos" alpha/2`

B

`2 "sin" alpha/2`

C

2

D

none of these

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The correct Answer is:
A
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