Partial differential - difference of opinion

[Roodles01]

I have a difference of opinion with 2 calculation engines.

equation to solve is;
d/dx (a(x^2 +y)

Wolframalpha of course is a very trusted source but I also use symbolab.
Here is a screenshot of the differential I want from both sites and associated answers.

. . . and the wolfram solution

could anyone please confirm which is correct.
Personally I like the symbolab solution.

 

[ShayanJ]

The point is, wolfram assumed you mean a is a function and its argument is x^2+y. You should have written a*(x^2+y).

 

[Roodles01]

oops sorry. Just me being lazy