The envelope of moving line on the hypocycloid plane may be an epicycloid or cardioid and the...
逆运动中与动切成定角的直,其包络也是圆周.
The envelope of moving line on the hypocycloid plane may be an epicycloid or cardioid and the...
逆运动中与动切成定角的直,其包络也是圆周.
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