docs: public static BigComplex atan(BigComplex x, MathContext mathContext) {
  		MathContext mc = new MathContext(mathContext.getPrecision() + 4, mathContext.getRoundingMode());
  
  		return log(I.subtract(x, mc).divide(I.add(x, mc), mc), mc).divide(I, mc).divide(TWO, mc).round(mathContext);
  	}