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สมการพาราโบลา
Author:
Sao Saw Kanitta
สมการมาตรฐาน (x-h)^2=4c(y-k) จุดยอด V(h,k) จุดโฟกัส F (h,k+c) เส้นไดเรกตริก y=k-c
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