Basic computer algebra. Symbolic integration, differentiation and simplification just works miles better in Mathematica than any of the open alternatives I've

Basic computer algebra. Symbolic integration, differentiation and simplification just works miles better in Mathematica than any of the open alternatives I've tried. It's quite common that the open alternatives just choke on something quite simple. In Mathematica, you can just use Simplify[] to get a nicely simplified expression. In Maxima/Sympy, you might be able to get the same result but you need to understand how the simplification algorithms work, ie. you have to choose which simplification method to apply based on the task and might need to apply more than one method to reach the goal. Additionally: Mathematica is pretty darn simple to use and well documented. Going through the docs of Maxima, Sympy, etc requires you to be a domain expert in computer algebra. I am not. I just want something to assist me when a basic algebra task would require several sheets of paper and I'd be likely to make mistakes. I am not even going to talk about the UI, plotting and other features. I haven't used them much. I have not tried XCas yet, perhaps it's more suitable for my purposes. Some commercial calculators (ie. physical devices) are based on XCas. note: I've been mostly working on some basic university level physics related to space flight and orbital mechanics. Stuff like Kepler's equations or rocket equation solutions.