※ 引述《barry881028 (Joker)》之銘言：
: 請問此題的第二小題的星形線參數式是如何得到的呢？？
: https://i.imgur.com/vxURpKl.jpg
: https://i.imgur.com/EeSsvxG.jpg
u = x^(1/3)
v = y^(1/3)
u^2 + v^2 = a^(2/3)
=> u = a^(1/3) cosk
v = a^(1/3) sink
=> x = a (cosk)^3
y = a (sink)^3