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作者 evilkiss 在 PTT [ Math ] 看板的留言(推文), 共5則
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5F→:我是覺得角度的地方很奇怪 想看證明08/19 14:19
6F→:不覺得arcCos(x/a)=arcSin(y/b) 如果(x0,y0)=O08/19 14:20
10F→:那個角度用x,y,a,b算得出來嗎?08/19 15:05
11F→:K是(x,y)投影到外接圓再連到中心 與X軸的夾角~08/19 15:10
12F→:大陸網站也是不錯用= =08/19 15:11
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