What parser for mathematical expressions on Qt would you recommend?

Question

Mathematics

Tell me, please, some library that could be put into a Qt project without much difficulty. I tried to put muParser, but it doesn't work. Either diarrhea or scrofula with this library.
I need to be able to pass a string to a function (with a variable, constants, arithmetic operations, trigonometric functions and parentheses for precedence) that would return a value.

Answer 1

Egorithm , Great, now you have the *.a library file, the *.h include files, and the *.so shared library.
Tasks, in order of priority.
1. Force the program to compile, for this you need to register access to the *.h include-files in the project.
2. Force the program to link, for this you need to register access to *.a in the project (-lmuparser -L$$PWD).
3. Make the program run by dropping * .so where necessary.

Answer 2

Is writing yourself not an option? There should be 100 lines of code if you use math and stack.