{"result":{"text":"begin mathsize 14px style f open parentheses fraction numerator 1 minus x over denominator 1 plus x end fraction close parentheses comma f open parentheses fraction numerator 1 plus x over denominator 1 minus x end fraction close parentheses equals f open parentheses fraction numerator 1 minus x over denominator 1 plus x end fraction close parentheses plus f open parentheses fraction numerator 1 plus x over denominator 1 minus x end fraction close parentheses end style"},"status":"ok"}