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If tanx=3/4, pi<(x)<(3pi)/2, then the va...

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

A

1) `-1/sqrt10`

B

2) `3/sqrt10`

C

3) `1/sqrt10`

D

4) `-3/sqrt10`

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