Ruby - Math.cos() Method
The Ruby Math.cos() method returns trigonometric cosine of an angle (angle should be in radians). The returned value will be of float type and in the range -1 through 1.
In the graph below, cos(x) vs x is plotted.
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
