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asec
Combined from primary sources listed below.

In Cool§

See primary documentation in context for routine asec. 

sub asec(Numeric(Cool))
method asec()

Coerces the invocant (or in sub form, its argument) to Numeric, and returns its arc-secant in radians.

say 1.asec;                 # OUTPUT: «0␤»
say sqrt(2).asec;           # OUTPUT: «0.785398163397448␤»