cos function calculates the cosine value. The angle is specified by arc degree method using π (pi function).
use Math::Trig 'pi'; cos(pi/3);
The pi function is defined in Math::Trig module.
cos function programming example
The following is a cos function programming example.
use strict; use warnings; use Math::Trig 'pi'; # cos(60°) = 1/2; print "cos(π/3) = " . cos(pi/3) . "\n";
Other trigonometric functions
Perl also has sin function in core functions.
The following article explains how to use other trigonometric functions such as tangent.