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Sketch the polar curve r=1+cosθ , and find the area , and the coordinates of the centroid of the region enclosed by the curve. 請問這條心臟線的質心怎麼算? 煩請各位幫忙... -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 61.229.53.238