How to add square root and log functions to my calculator?

Question

https://code.sololearn.com/WmqHu9PU8MlX/?ref=app

Also I want to display the inputs and output in the same text area, towards right bottom. Thanks

Answer 1

https://code.sololearn.com/W3PpNFX4o5DA/?ref=app

Answer 2

Микола Федосєєв Thanks You Sir.