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cos - Perldoc Browser
- #cos EXPR
- #cos
-
Returns the cosine of EXPR (expressed in radians). If EXPR is omitted, takes the cosine of
$_.For the inverse cosine operation, you may use the
Math::Trig::acosfunction, or use this relation:sub acos { atan2( sqrt(1 - $_[0] * $_[0]), $_[0] ) }
Perldoc Browser is maintained by Dan Book (DBOOK). Please contact him via the GitHub issue tracker or email regarding any issues with the site itself, search, or rendering of documentation.
The Perl documentation is maintained by the Perl 5 Porters in the development of Perl. Please contact them via the Perl issue tracker, the mailing list, or IRC to report any issues with the contents or format of the documentation.