docs: public static BigDecimal acoth(BigDecimal x, MathContext mathContext) {
  		checkMathContext(mathContext);
  		MathContext mc = new MathContext(mathContext.getPrecision() + 6, mathContext.getRoundingMode());
  		BigDecimal result = log(x.add(ONE, mc).divide(x.subtract(ONE, mc), mc), mc).divide(TWO, mc);
  		return round(result, mathContext);
  	}