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- var utils = require('../utils')
- , nodes = require('../nodes')
- , convert = require('./convert-angle')
- , asin = require('./asin');
- /**
- * Return the arccosine of the given `value`.
- *
- * @param {Double} trigValue
- * @param {Unit} output
- * @return {Unit}
- * @api public
- */
- module.exports = function acos(trigValue, output) {
- var output = typeof output !== 'undefined' ? output : 'deg';
- var convertedValue = convert(Math.PI / 2, output) - asin(trigValue, output).val;
- var m = Math.pow(10, 9);
- convertedValue = Math.round(convertedValue * m) / m;
- return new nodes.Unit(convertedValue, output);
- };
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