→ EdmundLiu :sorry，沒看到你說要用幅角 10/15 14:18
※ 引述《wmt98 (winner)》之銘言：
: Show that r=sin(θ-α) is the polar equation of a circle of diameter |c|。
: 幫幫忙吧，謝謝大家~感恩
計算一下curvature，
2(r')^2 -rxr'' + r^2
κ = ----------------------
[(r')^2 + r^2 ]^3/2
= 2cos^2 + 2sin^2
= 2
→ a circle of radius 1/2
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