If \(\cos \theta = \frac{{{x^2} - {y^2}}}{{{x^2}\; + \;{y^2}}}\) then the value of cot θ is equal to [If 0° ≤ θ ≤ 90°]

• A. \(\frac{{2xy}}{{{x^2} - {y^2}}}\)
• B. \(\frac{{2xy}}{{{x^2}{\rm{\;}} + {\rm{\;}}{y^2}}}\)
• C. \(\frac{{{x^2}{\rm{\;}} + {\rm{\;}}{y^2}}}{{2xy}}\)
• D. \(\frac{{{x^2} - {y^2}}}{{2xy}}\)