1. Plug in to cot2ø= a-c/b
A is the number infront of the x^2 term b is infornt of the xy term and c is infront of the y^2 point.
2. Solve for x and y prime by plugin in for x=xcosø-ysinø and y=xsinø-ycosø
3. After that substitute in the original equation.
4. Simplify and done
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