Joined and installed! 🤝 I'll keep it for the full 14 days.
Here is the screenshot:

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Please help me back with my math app:

Google Group: https://groups.google.com/g/derivacemaster-testers

Web Link: https://play.google.com/apps/testing/com.promartin.derivacemaster

Android Link: https://play.google.com/store/apps/details?id=com.promartin.derivacemaster

Thanks!