太棒了。以后学数学判断一个函数有界，单调性直观多了。还有三重积分的被积函数图像更好了！！！可以画二维，三维，极坐标图像！功能强大！并且是任意图像都可以！very good, i love it!猜猜我画的是什么函数？guess the kind of the function i draw.
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