Parametric Equations
http://archives.math.utk.edu/visual.calculus/0/parametric.6/index.html
http://www.anglia.co.uk/education/mathsnet/graphanim.html#Lissajou
IT Lesson
http://engchiu.tan.tripod.com/sec4/itpara.doc
http://engchiu.tan.tripod.com/sec4/graphmatica.exe
Simple Graph (Parametric Function)
http://www.ies.co.jp/math/java/calc/sg_para/sg_para.html
http://www.ies.co.jp/math/java/misc/param/param.html
