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設A(x1,y1)在曲線xy=-1上,則滿足x1y1=-1當曲線xy=-1繞座標原點逆時針旋轉45°後,A’點座標為(x2,y2)則x2=x1cos45°-y1sin45°=√2/2x1-√2/2y1y2=x1sin45°+y1cos45°=√2/2x1+√2/2y1方程聯立得:x1=√2/2(x2+y2…
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