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Find a point in the rotated
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Answer to Problem 11E
The coordinates of the point in the rotated coordinate system is
Explanation of Solution
Given:
Rotation of axes to eliminate xy-term:
The general second-degree equation
By rotating the coordinate axes through an angle
The coefficients of the new equation are obtained by making the following substitutions
And
Consider the value
Then the co-efficient are as below:
Multiplying equation (2) by
Adding equation (1) and (3),
Substituting the value of
Therefore the coordinates of the point in the rotated coordinate system is
Chapter 10 Solutions
Precalculus with Limits
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