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수학과 교육 2013년 7-8월호(99호) : 지오지브라로 부등식의 영역 그리기
[math](2 x^2 + 2 x + 1 - y ) ( x^2 + y^2 - 4 ) < 0 [/math]의 영역을 표시한 모습입니다.