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- var utils = require('../utils')
- , nodes = require('../nodes');
- /**
- * Return the tangent of the given `angle`.
- *
- * @param {Unit} angle
- * @return {Unit}
- * @api public
- */
- module.exports = function tan(angle) {
- utils.assertType(angle, 'unit', 'angle');
- var radians = angle.val;
- if (angle.type === 'deg') {
- radians *= Math.PI / 180;
- }
- var m = Math.pow(10, 9);
- var sin = Math.round(Math.sin(radians) * m) / m
- , cos = Math.round(Math.cos(radians) * m) / m
- , tan = Math.round(m * sin / cos ) / m;
- return new nodes.Unit(tan, '');
- };
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