If \(\tan x=\dfrac{b}{a}\), then \(\sqrt{\dfrac{a+b}{a-b}}+\sqrt{\dfrac{a-b}{a+b}}\) is equal to :

• A. \(\dfrac{2 \sin x}{\sqrt{\sin 2x}}\)
• B. \(\dfrac{2 \cos x}{\sqrt{\cos 2x}}\)
• C. \(\dfrac{2 \cos x}{\sqrt{\sin 2x}}\)
• D. \(\dfrac{2\sin x}{\sqrt{\cos 2x}}\)