[LaTeX ERROR: Convert failed] - Treat it like a normal polynomial, but whn you get an , replace with .
[LaTeX ERROR: Convert failed] - Use the complex conjugate of the denominator and multiply both top and bottom by that conjugate. (Complex Conjugate is given by taking the complex statement, keeping the real parts idenitcal and changing the sign of the negative part).
Example: [LaTeX ERROR: Convert failed] -> [LaTeX ERROR: Convert failed] -> [LaTeX ERROR: Convert failed] -> [LaTeX ERROR: Convert failed] -> [LaTeX ERROR: Convert failed]