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

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

A

`- 1/ sqrt10`

B

`3/sqrt 10`

C

`1/sqrt10`

D

`-3/sqrt10`

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A
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