Math.acosh() Javascript Method with Acrobat doesn't work (???)

Apparently all hyperbolic functions don't work!
If you're interested, here are the associated functions:

//********
// cosh **
//********
function cosh(x) {
	return (Math.exp(x)+Math.exp(-x))/2;
};

//*********
// acosh **
//*********
function acosh(x) {
	return Math.log(x+Math.sqrt(Math.pow(x,2)-1));
}

//********
// sinh **
//********
function sinh(x) {
	return (Math.exp(x)-Math.exp(-x))/2;
};

//*********
// asinh **
//*********
function asinh(x) {
	if (x===-Infinity) return x;
	else return Math.log(x+Math.sqrt(Math.pow(x,2)+1));
}

//********
// tanh **
//********
function tanh(x) {
	var a=Math.exp(+x);
	var b=Math.exp(-x);
	return a==Infinity?1:b==Infinity?-1:(a-b)/(a+b);
};

//*********
// atanh **
//*********
function atanh(x) {
	return Math.log((1+x)/(1-x))/2;
};

@+

Hi,

Instead of, you can use this function:

function trunc(x) {
	return Number(x.toString().substr(0,x.toString().indexOf(".")));
};

@+