solve cosine in swift

To solve cosine in Swift, you can use the built-in cos function in the Foundation framework. It takes an argument in radians and returns the cosine value.

Here's an example code snippet that computes the cosine of an angle in degrees:

main.swift
import Foundation

func cos(degrees: Double) -> Double {
    let radians = degrees * Double.pi / 180
    return Foundation.cos(radians)
}

// Example usage:
let angle = 30.0
let cosine = cos(degrees: angle)
print("cos(\(angle)) = \(cosine)")
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In this example, the cos function is defined as a custom function that takes an argument in degrees, converts it to radians, and calls the built-in cos function. You can then call this function with any angle in degrees to compute its cosine value.

Note that you need to import the Foundation framework to access the cos function.