y=abs(f(x))

저자:
민은기 (Min Eun Gi)
y=abs(f(x)) : https://goo.gl/rd3GTW YouTube : https://youtu.be/bZtU8lU-FH8 수학자료실 강의실 : https://goo.gl/czyJLW YouTube Channel : https://goo.gl/JpzU5i twitter : https://twitter.com/mineungi