What is math.cos() in Python?
The cos() function will return the cosine of a number. To be more specific, it returns the cosine of a number in radians.
Figure 1 shows the mathematical representation of the cos() function.
Note:
- The
mathmodule is required for this function.- This
cos()function only works for right-angled triangles.
Syntax
cos(num)
Parameter
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 / 180.0 )
Return value
cos() returns the cosine of a number (radians) that is sent as a parameter. The return value is in the range [-1,1].
Example
import math#positive number in radiansprint "The value of cos(2.3) : ", math.cos(2.3)#negative number in radiansprint "The value of cos(-2.3) : ", math.cos(-2.3)#converting the degrees angle into radians and then applying cos()#degrees = 180#PI = 3.14159265result = 180.0 * (math.pi / 180.0)print "The value of cos("+str(result)+") : ", math.cos(result)