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cos
Combined from primary sources listed below.

In Cool§

See primary documentation in context for routine cos. 

sub cos(Numeric(Cool))
method cos()

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

say 0.cos;                  # OUTPUT: «1␤»
say pi.cos;                 # OUTPUT: «-1␤»
say cos(pi/2);              # OUTPUT: «6.12323399573677e-17␤»