If sin theta =-4/5 and theta lies in...

If `sin theta =-4/5` and `theta` lies in third quadrant, then the value of `cos (theta/2)` is ............... A) `(1)/(sqrt5)` B) `-(1)/(sqrt5)` C) `sqrt((2)/(5))` D) `-sqrt((2)/(5))`

A

`(1)/(sqrt5)`

B

`-(1)/(sqrt5)`

C

`sqrt((2)/(5))`

D

`-sqrt((2)/(5))`

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The correct Answer is:

B

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