How to plot a Parametric Function in the HP49
You plot parametric functions writting the function as a complex number
For example,
Plot the function:
X=2*SIN(T)
Y=COS(T)

Press 2D/3D (the key F4)
to access PLOT
Press EDIT and type the equation  
In HP49 syntax one write
(2*SIN(T), COS(T))
or
2*SIN(T) + i*COS(T)
 
It converts automaticaly to
2*SIN(T) + i*COS(T) if
COMPLEX MODE is ON.
Press OK  
Set the independent variable as T  
Press ERASE DRAW
The plot is the elypsis
shown in the picture. 
