fsolve() crash with given Interval

[parisse]

plotimplicit is a plain CAS command, but displaying it is not supported in the Prime CAS history. To get something displayed, you must enter the command in the geometry SYMB view. Examples of plotimplicit commands from Xcas online help
plotimplicit(x^2+y^2-1,x,y)
plotimplicit(x^4+y^4=x^2-y^2)
plotimplicit(x^2+4*y^3-1)
plotimplicit(y^3=x^3-x^2,x,y,xstep=0.1,ystep=0.1)
plotimplicit(y^3=x^3-x^2,[x,y],xstep=0.1,ystep=0.1)
plotimplicit((x+5)^2+(y+4)^2-1,x=-6..-4,y=-5..-3)
plotimplicit((x+5)^2+(y+4)^2-1,[x=-6..-4,y=-5..-3])