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