docs: public static BigDecimal tanh(BigDecimal x, MathContext mathContext) {
  		checkMathContext(mathContext);
  		MathContext mc = new MathContext(mathContext.getPrecision() + 6, mathContext.getRoundingMode());
  		BigDecimal result = sinh(x, mc).divide(cosh(x, mc), mc);
  		return round(result, mathContext);
  	}