Ruby | Math cos() function

Last Updated : 12 Jul, 2025
The cos() is an inbuilt function in Ruby returns the cosine value of a given angle expressed in radians which is in range [-inf, +inf]. The returned value is in range [-1, +1].
Syntax: Math.cos(value) Parameters: The function accepts one mandatory parameter value whose corresponding cosine value is returned. Return Value: It returns the cosine value.
Example 1: CPP 
#Ruby program for cos() function

#Assigning values
val1 = 1 val2 = 0.5 val3 = -1 val4 = -0.9

#Prints the cos() value
                                      puts Math.cos(val1)
                                          puts Math.cos(val2)
                                              puts Math.cos(val3)
                                                  puts Math.cos(val4)
Output: 
 0.5403023058681398
0.8775825618903728
0.5403023058681398
0.6216099682706644
Example 2: CPP 
#Ruby program for cos() function

#Assigning values
val1 = 109 val2 = 133 val3 = -13243 val4 = -9898

#Prints the cos() value
                                            puts Math.cos(val1)
                                                puts Math.cos(val2)
                                                    puts Math.cos(val3)
                                                        puts Math.cos(val4)
Output: 
-0.577002178942952
0.4948722204034305
-0.37447564566939956
-0.40075875500376773
Reference: https://devdocs.io/ruby~2.5/math#method-c-cos
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