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If tan theta=(1)/sqrt(5) and theta lies ...

If `tan theta=(1)/sqrt(5)` and `theta` lies in the first quadrant, the value of `cos theta` is :

A

`sqrt((5)/(6))`

B

`-sqrt((5)/(6))`

C

`(1)/(sqrt6)`

D

`-(1)/(sqrt6)`

Text Solution

Verified by Experts

The correct Answer is:
A

`rArr cos theta = (sqrt5)/(sqrt6)`
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