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

If `"sin"theta=-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

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The correct Answer is:
C
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