Which language are you working with? Both versions of tan'(x) should be accepted, at least in the C#, Java and JS versions of the kata.

The expected format is given both by example tests and the way the derivation rules are described.

Thanks. This should have been a suggestion and not marked as issue.

The current random tests stops most of the obvious cheats. You are welcome to suggest test edits instead of just saying 'add random tests'.
I kind of assume people are here to learn, I dont understand what the joy is to to cheat on codewars.

Approved. Thanks!

I'm getting "Description cannot be approved, recent changes from related record must be merged first."

I think you need to create a new fork.

That is strange. I just tried it again and both sample tests and the full tests work for me.
Could you try in a different browser that is not logged in?

Tests running fine for me. Are you still getting this error ? May have been something temporarily.

Thank you for the suggestion. As previously said ideally it should test for every possible order but that would make for complicated tests.
The assignment is what it is, if instructions are followed and the derivation rules are followed in the way they are described then you will end up with a solution that passes the tests.

I dont see an issue here with the tests but thank you for the suggestion.

Great! Thank you.

Well it's not really allowed to cheat in any case.

There are random tests in the JS version.

Could you be more specific what you think is lacking in the tests ?

Sorry, it does return the correct result. I must have entered the test wrong.