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»