You are viewing the version of this documentation from Perl 5.005_02. View the latest version
sin EXPR
sin

Returns the sine of EXPR (expressed in radians). If EXPR is omitted, returns sine of $_.

For the inverse sine operation, you may use the POSIX::asin() function, or use this relation:

sub asin { atan2($_[0], sqrt(1 - $_[0] * $_[0])) }