类似matlab之类数学软件的画图（当然没有3D效果），e-tutor提供了一种在线画图工具，现在为beta版。可以对各种初等函数，多元方程等类别画图。移动方式像Google Maps，可进行拖拉和缩放。
http://www.e-tutor.com/et2/graphing
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