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If tan x = (3)/(4), pi lt x lt (3pi)/(2)...

If `tan x = (3)/(4), pi lt x lt (3pi)/(2)`, then the value of `cos""(x)/(2)` is

A

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

B

`(3)/(sqrt(10))`

C

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

D

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

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The correct Answer is:
A
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