If A + iB = tan (x + iy), then the value of tan 2x is as

• A. \(\frac{2A}{1+A^2 + B^2}\)
• B. \(\frac{2A}{1-A^2+B^2}\)
• C. \(\frac{2A}{1-A^2-B^2}\)
• D. None of these