Answer
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Work Step by Step
If the process involves the removing of the $xy$-term, the most time-consuming part would be to establish the rotation formulas and get the new equation without the $x'y'$-term.
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 9.4 - Rotation of Axes - Exercise Set - Page 1010: 43
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