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asinh
Combined from primary sources listed below.

In Cool§

See primary documentation in context for routine asinh. 

sub asinh(Numeric(Cool))
method asinh()

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

say 1.asinh;                # OUTPUT: «0.881373587019543␤»
say asinh(1);               # OUTPUT: «0.881373587019543␤»