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atan
Combined from primary sources listed below.

In Cool§

See primary documentation in context for routine atan. 

sub atan(Numeric(Cool))
method atan()

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

say atan(3);                # OUTPUT: «1.24904577239825␤»
say 3.atan;                 # OUTPUT: «1.24904577239825␤»