# Chapter 9 - Section 9.4 - Rotation of Axes - Concept and Vocabulary Check - Page 1009: 1

$cot(2\theta)=\frac{A-C}{B}$

#### Work Step by Step

To eliminate the $xy$ term, we need to rotate the original axes by an angle $\theta$, which satisfies the equation $cot(2\theta)=\frac{A-C}{B}$, where $A,B,C$ can be obtained from the original equation.

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