take the arctangent of a number in swift

To take the arctangent of a number in Swift, you can use the atan(_:) function from the Foundation framework. This function returns the arc tangent of a number in radians.

Here is an example code snippet:

main.swift
import Foundation

let x = 2.0
let y = atan(x) // returns 1.1071487177940904 (which is about 63.43 degrees)
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In this example, x is the number whose arc tangent we want to find, and y is the result of the atan(_:) function applied to x.

Note that the atan(_:) function takes a parameter of type Double and returns a value of type Double. If you have a parameter of a different numeric type, such as Float, you may need to convert it to Double before passing it to the atan(_:) function.