Take the trigonometric sine of the data array of each field.
fl.sin() is equivalent to cf.FieldList(f.sin() for f in fl).
See cf.Field.sin 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.FieldList.setprop
cf.FieldList.var
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