take the cosine of a number in swift

To take the cosine of a number in Swift, you can use the built-in cos function from the Darwin module, which provides access to the standard C math library. Here's an example:

main.swift
import Darwin

let x = 1.0
let y = cos(x)

print(y) // prints 0.5403023058681398
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In this example, we import the Darwin module to access the cos function. Then we define a variable x and set it to the value of the number we want to take the cosine of. Finally, we call cos(x) to compute the cosine of x and store the result in y. We then print the result using print(y).