mathjs
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Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser and offers an integrated solution to work with numbers, big numbers, complex numbers, units, and matrices.
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JavaScript
module.exports = {
'name': 'atan2',
'category': 'Trigonometry',
'syntax': [
'atan2(y, x)'
],
'description':
'Computes the principal value of the arc tangent of y/x in radians.',
'examples': [
'atan2(2, 2) / pi',
'angle = 60 deg in rad',
'x = cos(angle)',
'y = sin(angle)',
'atan2(y, x)'
],
'seealso': [
'sin',
'cos',
'tan'
]
};