Precalculus (6th Edition) Blitzer

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 1011: 57


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Work Step by Step

The given equation is a circle centered at the origin. Rotation of this equation with any angle will not change its form, which means we will get $(x')^2+(y')^2=r^2$ without even using the transformation formulas.
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