Answer
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A hyperbola can be defined as all points on a plane where the difference of distances from two fixed points (foci) is a constant.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 9 - Section 9.2 - The Hyperbola - Exercise Set - Page 983: 67
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