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Problem
Two parabolas have the same focus. If their directrices are the X -axis and the Y -axis, respectively, then the slope of their common chord is a.
±
1
\pm 1
±
1
b.
4
3
\frac{4}{3}
3
4
c.
3
4
\frac{3}{4}
4
3
d. None of these
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