Plot that function
The function plotter will currently deal with any multiple results consequent on the use of square root - but only if you use SQR() - not z^0.5. The different sets of results are not joined (it's not easy to know how) - so, if you are trying to plot an ellipse / circle you will never get it closed up - but the gaps get smaller the more steps you use.
Some formulae to try:
Ellipse: y=sqr(a-x^2); a=101, x -10 to 10 by 0.2
Sine wave: y=sin(x); x= -3.3 to 3.3 by 0.1
Sin(1/x): y=sin(1/x); x=0.1 to 0.5 by 0.005