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cos - cosine function
cos EXPR
Returns the cosine of
EXPR (expressed in radians). If
EXPR is omitted, takes cosine of
$_
.
For the inverse cosine operation, you may use the POSIX::acos()
function, or use this relation:
sub acos { atan2( sqrt(1 - $_[0] * $_[0]), $_[0] ) }
If rather than formatting bugs, you encounter substantive content errors in these documents, such as mistakes in the explanations or code, please use the perlbug utility included with the Perl distribution.
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