In Swift, the cos() function returns the cosine of a number.
The mathematical representation of the cos() function is shown below:
Note: We need to import
Foundationin our code to use thecos()function. We can import it usingimport Foundation.
cos(number)
//number can be real, float, or double.
This function requires a number that represents an angle in radians as a parameter.
To convert degrees to radians, use the following formula:
radians = degrees * ( pi / 180 )
This function returns the cosine of the number that is sent as a parameter. The return value will be between -1 and 1.
import Swiftimport Foundation//positive number in radiansprint("The value of cos(2.3) :", cos(2.3));// negative number in radiansprint("The value of cos(-2.3) :", cos(-2.3));//converting the degrees angle into radians and then applying cos()// degrees = 180.0// PI = 3.14159265print("The value of cos(180.0 * (PI / 180.0)) :", cos(180.0 * (Double.pi / 180.0)));
Foundation header required for the cos() function.cos() to calculate the cosine of the positive number in radians.cos() to calculate the cosine of the negative number in radians.cos() to convert the angle in degrees to radians and calculate its cosine.