f1 is cos(x), so the argument of the function is x while its operator is cos. f2 is +(cos(x),sin(x)), so the operator is + and the arguments are [cos(x), sin(x)]
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f1 is cos(x), so the argument of the function is x while its operator is cos. f2 is +(cos(x),sin(x)), so the operator is + and the arguments are [cos(x), sin(x)]