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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)/(sqrt(10))`

B

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

C

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

D

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

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A
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