Ruby – Find Cosine – cos() Method – Examples & Explanation

Ruby CMath Library, Ruby Reference

In Ruby, cos() is a method in CMath class which is used to find the cosine of any given complex number and this number must be in radians. To find out cosine of any given complex number CMath.cos() method is used.

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cos() Method in Ruby

cos() method exists in Standard CMath Library of Ruby. The purpose of this method is to provide the cosine of any given complex number and this number must be in radians.

 

Syntax of the cos() Method in Ruby

Syntax of cos() method is:

cmath.cos(x)

 

Parameter of cos() Method in Ruby

Parameter Description
x Any valid complex number. This parameter is required.

Note: If the x parameter is not a complex number, cos() method will return an error.

 

Return Value of cos()

cos() method will return the cosine of any given complex number and this number must be in radians.

 

Ruby – Get the cos() of the Given Numbers

 # import CMath library 
 require 'cmath' 
 x = CMath.cos(5 + 5i) 
 puts x

Output

21.050556181654844+71.1552598809822i

 

Ruby – Various Ways of Calculation in cos() Method

 # import CMath library 
 require 'cmath' 
 x = CMath.cos(-10 + 5i) 
 puts x

Output

-1.490839765215787+0.03976617365742172i

 

Ruby – Various Ways of Calculation in cos() Method

 # import CMath library
 require 'cmath' 
 x = CMath.cos(10 + 0i) 
 puts x

Output

-0.8390715290764524+0.0i

 

Ruby – Non-Complex Nubmer in cos() Method Produces Error

 # import CMath library 
 require 'cmath' 
 x = CMath.cos(a10 - b5i) 
 puts x

Output
Error

 

Ruby – Get the cos() of Negative Number

 # import CMath library 
 require 'cmath' 
 x = CMath.cos(-10) 
 puts x

Output

-0.8390715290764524