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QUESTION
How do I find the directrix of a hyperbola?
The directrix is the line ##x=(a^2)/c##.
For a hyperbola ##(x-h)^2/a^2-(y-k)^2/b^2=1##,
where ##a^2+b^2=c^2##,
the directrix is the line ##x=a^2/c##.
