Hamza.S,
Thanks for the report! I fixed it and released a new version v1.1. You can download it at the GitHub release page. If you find any more bugs, feel free to open an issue on the GitHub because that will alert me to it much quicker than here

That's definitely a bug I'll have to fix. Whoops! As a workaround, you can also simplify Y2 to Y2 and it should finish evaluating that derivative.

PineappleCAS v1.0 is released! You can download it here: https://github.com/nathanfarlow/PineappleCAS/releases

Thanks for all your support on the project Adriweb

Hello! You might know me from the Symbolic Derivative Project . I thought I could do better so I am working on a CAS (computer algebra system) for the TI 84+ CE. It is nearly done and I want to tease a little bit about the progress and work I still have to do before it is released. It is called Pine...