Question: How to hundle functions ?

Hey guys !


I wondered if it's possible in maple to hundle functions, for exemple to know if a function is a sum or a product of two functions.


Is there a function like this : sum (\x -> x+3)  -------->  [(\x -> x), \x -> 3] ?


If I ask this, is because I want to know if it's possible de rewrite the function `deriv` or `integrate` or `simplify` by hands, without using the native functions.


If it's possible, do you have an exemple of this ?

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