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12 lines
320 B
12 lines
320 B
// 20.2.2.33 Math.tanh(x) |
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var $export = require('./$.export') |
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, expm1 = require('./$.math-expm1') |
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, exp = Math.exp; |
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|
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$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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}); |