又一个在线工具，这次比较专业，是一个函数图形计算工具，输入一个函数表达式，在左侧就会自动绘制出该函数的图形，当鼠标在图形曲线上滑动时会实时显示该点的坐标值，厉害！
Tags: calculator, graphing, Tools
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