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If cosx=-(4)/(5), where x in[0,pi], then...

If `cosx=-(4)/(5)`, where `x in[0,pi]`, then the value of `cos((x)/(2))` is equal to a)`(1)/(10)` b)`(2)/(5)` c)`(1)/(sqrt(10))` d)`-(2)/(5)`

A

`(1)/(10)`

B

`(2)/(5)`

C

`(1)/(sqrt(10))`

D

`-(2)/(5)`

Text Solution

Verified by Experts

The correct Answer is:
C
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