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acotan
Combined from primary sources listed below.

In Cool§

See primary documentation in context for routine acotan. 

sub acotan(Numeric(Cool))
method acotan()

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

say 45.acotan;              # OUTPUT: «0.0222185653267191␤»
say acotan(45)              # OUTPUT: «0.0222185653267191␤»