Take the trigonometric cosine of the data array for each field.
fl.cos() is equivalent to cf.FieldList(f.cos() for f in fl).
See cf.Field.cos for details.
If True then update the field list and its fields in place. By default a new field list containing new fields is created.
out : cf.FieldList
cf.AncillaryVariables.copy
cf.AncillaryVariables.count
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