If $$\tan 22 \frac{1}{2} = x$$, then the value of $$\cos 67 \frac{1^\circ}{2}$$ is

A

$$\frac{x}{\sqrt{x^2 + 1}}$$

B

$$\frac{1}{\sqrt{x^2 + 1}}$$

C

$$\frac{x}{\sqrt{x^2 - 1}}$$

D

$$\frac{1}{\sqrt{x^2 - 1}}$$