Desmos Quick Tips

Hide object: click leftmost numbered column on/off

Plot points:  (1,2),(3,4),(5,2)        Label:
  Tools --Convert to table
  Tools(again)--click color circle--Lines on   Label on (if not converted to table)
    Add first point to close the polygon

Restrict domain:  y=...   {-2<=x<4}

Nth root, fractional root:  KBD--Functions--Number theory-- N√

log Shift- to get into base area. 

Piecewise-defined:   y={x<-2: ...}
                     y={-2<=x<4: ...}
                     y={x>=4: ...}
     cannot do a single value x=3:   or interval of one 3<=x<=3:   just plot the point (3,f(3))

Plot a "hole: plot the undefined point, then Tools--select the open point 

Function composition:
f(x)=2x^2-3
g(x)=4x
evaluate: f(g(1))  
graph: f(g(x))