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cotan
Combined from primary sources listed below.

In Cool§

See primary documentation in context for routine cotan. 

sub cotan(Numeric(Cool))
method cotan()

Coerces the invocant (or in sub form, its argument) to Numeric, interprets it as radians, returns its cotangent, that is, the reciprocal of its tangent.

say 45.cotan;               # OUTPUT: «0.617369623783555␤»
say cotan(45);              # OUTPUT: «0.617369623783555␤»