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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)/(sqrt10)`

C

`- (1)/(sqrt5)`

D

`(1)/(sqrt10)`

Text Solution

Verified by Experts

The correct Answer is:
C
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