sin - return the sin of a number
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])) }
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