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      First setup: please restart your computer when "restart ..." is showed in setup. Then click "setup" again after the computer has be restarted. Please click "Yes" when some dialog boxes displayed during setup.

     Before setup version registered ( with serial number), suggest you uninstall trial version first (Please click "Keep" when some dialog boxes are showed). If not, some dialog boxes will be showed in setup, Please select “No”.

      Uninstall: click "Keep" when some dialog boxes displayed during uninstall.

Operation

1. Move curves and points must be in "Single". Select tow curves or three points at the same time must be in "mutile".
2. The point and point can be linked by line to form a new line or by segment line to form a new segment line. Ways: Click the button of "Ellipse --> Select "3 points" in List Box --> Select "Mutile" in  "Selection" --> Click points (there is a small circle around it when selected. If 2 points or 3 points can not be selected sporadically, please do it again).
3.  Measure angles and triangle  areas: select "parameter" in "Show" first, then : Click the button of "Ellipse" --> Select "3 points" in List Box --> Select "Mutile" in  "Selection" --> Click points orderly. Three angles or three triangle areas can be showed at the same time. Then select "Single"
4. Set a point intersected with x axis: plot a straight line (k=0,b=0. superposition )
5. Plot a straight line which is vertical  with x axis: in "linear", select "(x1,y1),(x2,y2) in list and enter same x.
6. Make symbols and expressions: please press "Inter" in keyboard when starting newline.
7. If your computer is wide screen, the area for plotting show rectangle but not square , namely circle you plot will change to “ellipse”. Please move mouse to the side of form, arrow changes to horizontal double arrow, then dragging mouse flatly to adjust it.