The Preferences window include the FCurves preference settings.
The FCurves preference settings include the options to use anti-aliasing and to display multiple tangents.
To access the FCurves preferences:
 Preferences.
 Preferences. 
            The FCurves preference settings display.
 
                     FCurves preferences
The following table describes the FCurves preference settings.
 Except where otherwise noted, this work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
 Except where otherwise noted, this work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License