code: public static BigFloat cosh(BigFloat x) {
  		if (x.isNaN())
  			return NaN;
  		if (x.isInfinity())
  			return POSITIVE_INFINITY;
  		if (x.isZero())
  			return x.context.ONE;
  		return x.context.valueOf(BigDecimalMath.cosh(x.value, x.context.mathContext));
  	}
docs: Returns the {@link BigFloat} that is <code>cosh(x)</code>.
  
  @param x the value
  
  @return the resulting {@link BigFloat}
  
  @see BigDecimalMath#cosh(BigDecimal, MathContext)