Examples
Input:
plotinequation(x^2-y^2<3, [x=-2..2,y=-2..2],xstep=0.1,ystep=0.1)
Output:
Input:
plotinequation([x+y>3,x^2<y], [x-2..2,y=-1..10],xstep=0.2,ystep=0.2)
Output: