If $\tan \theta=\frac{1}{\sqrt{5}}$ and $\theta$ lies in the first quadrant, the value of $\cos \theta$ is :
If $\tan \theta=\frac{1}{\sqrt{5}}$ and $\theta$ lies in the first quadrant, the value of $\cos \theta$ is :
- A
$\sqrt{\frac{5}{6}}$
- B
$-\sqrt{\frac{5}{6}}$
- C
$\frac{1}{\sqrt{6}}$
- D
$-\frac{1}{\sqrt{6}}$
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