Graph of inequations with 2 variables : plotinequation inequationplot

plotinequation([f1(x,y)<a1,...fk(x,y)<ak],[x=x1..x2,y=y1..y2]) draws the points of the plane whose coordinates satisfy the inequations of 2 variables :

$$\left\{\vphantom{ \begin{array}{ccc} f1(x,y) &<&a1 \\ & ... & \\ fk(x,y)&<&ak \end{array}}\right.$$$$\begin{array}{ccc} f1(x,y) &<&a1 \\ & ... & \\ fk(x,y)&<&ak \end{array}$$,    x1 $$\leq$$ x $$\leq$$ x2, y1 $$\leq$$ y $$\leq$$ y2

Input :

plotinequation(x^2-y^2<3, [x=-2..2,y=-2..2],xstep=0.1,ystep=0.1)

Output :

the filled portion enclosing the origin and limited by the hyperbola x^2-y^2=3

Input :

plotinequation([x+y>3,x^2<y], [x-2..2,y=-1..10],xstep=0.2,ystep=0.2)

Output :

the filled portion of the plane defined by -2<x<2,y<10,x+y>3,y>x^2

Note that if the ranges for x and y are not specified, Xcas takes the default values of X-,X+,Y-,Y+ defined in the general graphic configuration (Cfg $\blacktriangleright$Graphic configuration).