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Ruby - Math.cos() Method



The Ruby Math.cos() method returns trigonometric cosine of an angle (angle should be in radians). The return value will be of float type and in the range -1 through 1.

In the graph below, cos(x) vs x is plotted.

Cos Function

Syntax

Math.cos(x)

Parameters

x Specify the angle in radian.

Return Value

Returns the trigonometric cosine of an angle.

Example:

In the example below, Math.cos() method is used to find out the trigonometric cosine of an angle.

#Math::PI - value of PI from Math module
pi = Math::PI

puts "Math.cos(pi/6) = #{Math.cos(pi/6)}"
puts "Math.cos(pi/4) = #{Math.cos(pi/4)}"
puts "Math.cos(pi/3) = #{Math.cos(pi/3)}"

The output of the above code will be:

Math.cos(pi/6) = 0.8660254037844387
Math.cos(pi/4) = 0.7071067811865476
Math.cos(pi/3) = 0.5000000000000001

❮ Ruby Math Module

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