document.write("Math.atanh(0.9) = " + Math.atanh(0.9) + "<br />");
document.write("Math.atanh(-2) = " + Math.atanh(-2) + "<br />");
document.write("Math.atanh(-1) = " + Math.atanh(-1) + "<br />");
document.write("Math.atanh(2) = " + Math.atanh(2) + "<br />");
document.write("Math.atanh(1) = " + Math.atanh(1) + "<br />");
document.write("Math.atanh(0.5) = " + Math.atanh(0.5) + "<br />");
document.write("Math.atanh(0) = " + Math.atanh(0) + "<br />");
document.write("Math.atanh(Infinity) = " + Math.atanh(Infinity) + "<br />");
/*
run
Math.atanh(0.9) = 1.4722194895832204
Math.atanh(-2) = NaN
Math.atanh(-1) = -Infinity
Math.atanh(2) = NaN
Math.atanh(1) = Infinity
Math.atanh(0.5) = 0.5493061443340549
Math.atanh(0) = 0
Math.atanh(Infinity) = NaN
*/
