Add support for integration and more complex functions

[trevortrusty]

Love this library, could be very useful. Mathparse could also make a good alternative to the pricey Wolfram Alpha python API because of the natural language input that translates into mathematical functions, if you were to add support for Integration, summations, solving, graphing, etc.

[stur86]

This seems way too ambitious; however it would be really useful to at least add support for trigonometric functions like sin, cos etc - or really, at least all of the unary functions from the standard library math module. Should be very easy (even if it meant adding support only for them in "math" mode, and no natural language equivalent for everything).

[gunthercox]

@stur86 That's a good call out, I'd be happy to add in support to make sure there is some level of parity with the standard math library functions.

[stur86]

Do you want help? I'd be happy to fork and send a PR. I'm using mathparse in a project for a hackathon (using it essentially as a tool for an LLM to call) and it'd expand its power a bit. Seeing the code it doesn't seem a very complex addition, plus I can provide Italian keys/translations at the very least as that's my native language.

[gunthercox]

A contribution would be amazing, feel free to submit a PR.