My own created website https://graph2d.com can work in any device e.g. Mobile, Tab, laptop, Desktop pc etc and any website browsers. It can draw anyimplicit function,Complex analysis, polar function,parametric function, linear programming, Or operation research, mechanics, graph of inequality, simple calculator etc
Welcome to my website Free graphing calculator
As for example, consider the function is given bellows-
The graph of the piecewise function is given bellows-