theorem.js/src/includes/functions/math/trig/atan2.js

A Math library for computation in JavaScript

atan2(x, y) {
	x = [BigNumber(x).toNumber()]
	y = [BigNumber(y).toNumber()]
	let result = []
    for (var i = 0; i < x.length; i++) {
    	result.push(Math.atan2(x[i], y[i]))
    }
	return result.length == 1 ? result[0] : result
}