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acotanh
Combined from primary sources listed below.

In Cool§

See primary documentation in context for routine acotanh. 

sub acotanh(Numeric(Cool))
method acotanh()

Coerces the invocant (or in sub form, its argument) to Numeric, and returns its Inverse hyperbolic cotangent.

say acotanh(2.5);           # OUTPUT: «0.423648930193602␤»