| 1 | var annotate = require('annotate');
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| 2 | var is = require('annois');
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| 3 |
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| 4 |
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| 5 | module.exports = annotate('acos', 'Returns the arccosine (in radians) of a number').
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| 6 | on(function betweenOnes(a) {
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| 7 | return is.number(a) && -1 <= a && a <= 1;
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| 8 | }, Math.acos);
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