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a^2 = 25
a = 5
b^2 = 16
c^2 = a^2-b^2
c^2 = 25-16
c^2 = 9
c = 3
maka persamaan garis direktriks :
x = p kurang lebih a^2/c
x = 2 kurang lebih 25/3
^ itu pangkat