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수학과 교육 2012년 7-8월호(93호) : 지오지브라로 삼각함수 그래프 그리기(2)
점 A가 움직일 때, 기하창 2에서는 [math]( \alpha, x(A) )[/math]의 점의 자취가 그려집니다.