The envelope of moving line on the hypocycloid plane may be an epicycloid or cardioid and the...
摆中与切成定角直,其包络也是圆周渐开.
The envelope of moving line on the hypocycloid plane may be an epicycloid or cardioid and the...
摆中与切成定角直,其包络也是圆周渐开.
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