Didn't see your message before, sorry. Could you show me an example, please? I'm not following.

Help us help you. Tellus what language you have this problem in.

Also, is this really a kata issue? Sounds like a CodeWars issue.

Closing.

Edit: How do you remove comments? :')

you can't... x) (unless it's the first comment of a thread without answers... CW feature! x) )

Thanks :D
The commutativity issue still persists. Either the description needs to be updated to specify the form of the result or all cases accepted.

"Just" the string message that wasn't updated with the actual value of the tets, sorry for this. ;)

Corrected.

Hi there I'm still failing on some random tests even tough the code should work. The proposed "correct" result can't be correct.
Example: diff (cos (* 52 x)) --> Expected: (* 3 (* 2 x)) or (* 6 x) which is incorrect

Edit: commutativity of multiplication is also still a problem
Edit2: Otherwise a really great Kata

If I create a buffer variable in global scope it sometimes gets carried over to the next assert statement and sometime does not.

lol

that's not really important. Tags behave the same way than the search engine, on CW: weird & inconsistent... x) Moreover, you'll see that sometimes, tags you set in the edit panel don't even show up in the kata/detail pages. So just choose what you think is appropriate and don't bother with that... ;)

What other tags would this belong to?

Edit: How do you remove comments? :')