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cosech
Combined from primary sources listed below.

In Cool§

See primary documentation in context for routine cosech. 

sub cosech(Numeric(Cool))
method cosech()

Coerces the invocant (or in sub form, its argument) to Numeric, and returns its Hyperbolic cosecant.

say cosech(pi/2);           # OUTPUT: «0.434537208094696␤»