sin

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 Math::Trig::asin function, or use this relation:

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

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https://perldoc.perl.org/5.20.2/functions/sin.html