Start3d(); Putaxes3d(4); Xyzax3data("","x=[-5,5]","y=[-5,5]","z=[-5,5]"); fd=[ "z=x^2-y^2","x=[-2,2]","y=[-2,2]","senw" ]; if(Isangle(), Sf3data("1",fd); , Startsurf(); Sfbdparadata("1",fd); Crvsfparadata("1","ax3d","sfbd3d1",fd); if(Gccexists(), ExeccmdC("1"); ); ); Windispg();