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If sintheta=(-4)/(5) and theta lies in t...

If `sintheta=(-4)/(5) and theta` lies in third quadrant, then the value of `cos""(theta)/(2)` is

A

`1/5`

B

`-1/sqrt(10)`

C

`-1/sqrt(5)`

D

`1/sqrt(10).`

Text Solution

Verified by Experts

The correct Answer is:
C
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