12 lines
320 B
JavaScript
12 lines
320 B
JavaScript
// 20.2.2.33 Math.tanh(x)
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var $export = require('./$.export')
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, expm1 = require('./$.math-expm1')
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, exp = Math.exp;
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$export($export.S, 'Math', {
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tanh: function tanh(x){
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var a = expm1(x = +x)
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, b = expm1(-x);
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return a == Infinity ? 1 : b == Infinity ? -1 : (a - b) / (exp(x) + exp(-x));
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}
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}); |