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What is Math.cos() in Ruby?

Harris Amjad

Grokking Modern System Design Interview for Engineers & Managers

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The cos() function in Ruby calculates 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.

Figure 1: Mathematical representation of cosine function

Note:

  • This function is present in the Math module.
  • 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 that is sent as a parameter. The return value is in the range [-1,1].

Example

#positive number in radians
puts "The value of cos(2.3) : ", Math.cos(2.3)
#negative number in radians
puts "The value of cos(-2.3) : ", Math.cos(-2.3)
#converting the degrees angle into radians and then applying cos()
#degrees = 180
#PI = 3.14159265
result = 180.0 * (Math::PI / 180.0)
puts "The value of cos(#{result}) : ", Math.cos(result)

RELATED TAGS

ruby
math
cos
communitycreator

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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