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### `functor`, `args`, `funargs`

`functor(func)`
  :: Functor of function form func.
`args(func)`
  :: List of arguments of function form func.
`funargs(func)`
  :: `cons(functor(func),args(func))`.

return
  `functor()` : indeterminate, `args()`, `funargs()` : list
func
  function form

- See section `vtype` for function form.
- Extract the functor and the arguments of function form func.
- Assign a program variable, say `F`, to the functor obtained by `functor()`. Then, you can type (`*F`)(x) (, or (`*F`)(x,y,...) depending on the arity,) to input a function form with argument x.

    [0] functor(sin(x));
    sin
    [0] args(sin(x));
    [x]
    [0] funargs(sin(3*cos(y)));
    [sin,3*cos(y)]
    [1] for (L=[sin,cos,tan];L!=[];L=cdr(L)) {A=car(L);
    print(eval((*A)(@pi/3)));}
    0.86602540349122136831
    0.5000000002
    1.7320508058

`References`
  section `vtype`.

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