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tan
Combined from primary sources listed below.

In Cool§

See primary documentation in context for routine tan. 

sub tan(Numeric(Cool))
method tan()

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

say tan(3);                 # OUTPUT: «-0.142546543074278␤»
say 3.tan;                  # OUTPUT: «-0.142546543074278␤»