Array ( [0] => Array ( [title] => L17A [link] => https://www.youtube.com/embed/IRHKg91CsTg ) [1] => Array ( [title] => L17B [link] => https://www.youtube.com/embed/zpBiz2rlhvM ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第17R講 從極座標轉成直角座標 從直角坐標轉成極座標 10.3 Sketching curves in Polar Coordinates