The envelope of moving line on the hypocycloid plane may be an epicycloid or cardioid and the...
摆线中与切线成定角直线,其包络也是圆周渐开线.
The envelope of moving line on the hypocycloid plane may be an epicycloid or cardioid and the...
摆线中与切线成定角直线,其包络也是圆周渐开线.
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